CN104037718B - A kind of monocycle current-control power modular device - Google Patents
A kind of monocycle current-control power modular device Download PDFInfo
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- CN104037718B CN104037718B CN201410274393.5A CN201410274393A CN104037718B CN 104037718 B CN104037718 B CN 104037718B CN 201410274393 A CN201410274393 A CN 201410274393A CN 104037718 B CN104037718 B CN 104037718B
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Abstract
The present invention relates to a kind of monocycle current-control power modular device, it includes for receiving pwm signal the drive circuit driving switching power devices B1 to work；Also include the current sensing means for gathering switching power devices B1 operating current, described current sensing means is connected with monocycle current control circuit, the outfan of monocycle current control circuit is connected with drive circuit, and the input of monocycle current control circuit receives pwm signal；The operating current of the switching power devices B1 detected is transmitted to monocycle current control circuit by current sensing means；The present invention can produce overcurrent protection signal; this overcurrent protection signal can be closed and latch switch assembly immediately, it is ensured that the electric current in switch module is unlikely to excessive, after next pwm pulse signal arrives; also can drive switch module by automatic unlocking, allow power model remain valid work.
Description
Technical field
The present invention relates to a kind of power module device, especially a kind of monocycle current-control power modular device, belong to the technical field that power model controls.
Background technology
In the market for the protective measure of traditional power model; generally sample rate current exports to external control circuit; being provided protection signal by external control circuit again, protect power model by the way of protection signal at stop drive circuit, there is following weak point in it:
1, power model internal detection current device sends over-current signal to external control circuit, then is judged and close drive circuit by external control circuit, and this control mode also exists signal lag.Because the time of switch module overcurrent damage generating process is the shortest, when there is overcurrent condition, within this signal lag time, protection act also do not made by controller, and switch module may overcurrent damage.
2, power model internal detection current device sends over-current signal, after control circuit is closed and latched drive circuit, closes and can not automatically recover with latch signal, and power model likely quits work.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art; a kind of monocycle current-control power modular device is provided; it can trigger generation overcurrent protection signal; overcurrent protection signal can be closed and latch switch assembly immediately; ensure that the electric current in switch module is unlikely to excessive; after next control wave arrives, also can drive switch module by automatic unlocking, allow power model remain valid work.
The technical scheme provided according to the present invention, described monocycle current-control power modular device, including for receiving pwm signal the drive circuit driving switching power devices B1 to work；Also include the current sensing means for gathering switching power devices B1 operating current, described current sensing means is connected with monocycle current control circuit, the outfan of monocycle current control circuit is connected with drive circuit, and the input of monocycle current control circuit receives pwm signal；The operating current of the switching power devices B1 that detection is obtained by current sensing means transmits to monocycle current control circuit；
When the operating current of described switching power devices B1 mates with the protective current preset in monocycle current control circuit; monocycle current control circuit drives to drive circuit transmission and stops signal; to close switching power devices B1 by drive circuit, until the PWM input signal in next cycle triggers monocycle current control circuit；After PWM input signal triggers monocycle current control circuit, described monocycle current control circuit drives enabling signal to drive circuit transmission, to drive switching power devices B1 to work by drive circuit.
Described switching power devices B1 includes at least one power switch component, described power switch component is the structure on DBC substrate or metal basal board equipped with at least one chip, or is provided with the structure of at least one discrete power switching device on metal basal board or PCB substrate.
Described chip, discrete power switching device are full-control type semiconductor device or half control type semiconductor device.
Described monocycle current control circuit includes at least one voltage comparator circuit and at least one flip-flop circuit, the outfan of described voltage comparator circuit is connected with the set end of flip-flop circuit, the outfan of flip-flop circuit is connected with drive circuit, and the reset terminal of flip-flop circuit is connected with pwm signal.
Described current sensing means includes sampling resistor circuit or current transformer.
Default protective current in described monocycle current control circuit is directly set by voltage comparator circuit, or is adjusted according to the default protective current of the duty setting direct to voltage comparator circuit of switching power devices B1.
Described flip-flop circuit includes that reset terminal can receive the trigger of at least one road pwm signal, the set end of trigger is connected with voltage comparator circuit, voltage comparator circuit includes at least one voltage comparator, one input of described voltage comparator is connected with the outfan of current sensing means, and another input of voltage comparator is connected with setting bleeder circuit；The outfan of voltage comparator connects the set end of trigger, trigger can be carried out set.
Advantages of the present invention: after using monocycle Current Control Technology; the electric current born in each working cycle in switching power devices is by pwm signal control; once pwm signal is out of control; the electric current in switching power devices is caused quickly to increase; over-current protection point quick closedown switching power devices at switching power devices; thus protect switch module safely and reliably, improve the reliability of switching power devices.
Within a working cycle, when switching power devices produces overcurrent, voltage comparator circuit and flip-flop circuit close and latch the drive circuit of switching power devices, allows and is no longer flow through electric current in switching power devices.The pwm signal energy reset flip-flop circuit rapidly of next cycle, unlocks overcurrent protection signal, makes pwm signal pass through drive circuit and drives switching power devices, allows switching power devices normally work.
By the way of regulating ratio is compared with voltage, the overcurrent set point change of switch module in switching power devices can be allowed.As when ambient temperature is higher, the maximum allowed current of general switch module can reduce, at this moment can be by being reduced by the comparison voltage of overcurrent set point, so that the maximum current flow through in switch module reduces the most accordingly, power model is reliably protected.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the present invention.
Fig. 2 is the structured flowchart that the multiple sampling resistor of the present invention constitutes current sensing means.
Fig. 3 is the structured flowchart that the single sampling resistor of the present invention constitutes current sensing means.
Fig. 4 is the structured flowchart of the present invention integrated sampling pole.
Fig. 5 is the regulating ratio of the present invention structured flowchart compared with voltage.
Detailed description of the invention
Below in conjunction with concrete drawings and Examples, the invention will be further described.
Signal the drive circuit that drives switching power devices B1 to work as shown in Figure 1: the present invention includes for receiving PWM(Pulse Width Modulation)；Also include the current sensing means for gathering switching power devices B1 operating current, described current sensing means is connected with monocycle current control circuit, the outfan of monocycle current control circuit is connected with drive circuit, and the input of monocycle current control circuit receives pwm signal；Operating current in the switching power devices B1 that current sensing means will detect transmits to monocycle current control circuit；
When the operating current of described switching power devices B1 mates with the protective current preset in monocycle current control circuit; monocycle current control circuit drives to drive circuit transmission and stops signal; to be closed the duty of switching power devices B1 by drive circuit, until the pwm signal in next cycle triggers monocycle current control circuit；After pwm signal triggers monocycle current control circuit, described monocycle current control circuit drives enabling signal to drive circuit transmission, to drive switching power devices B1 to work by drive circuit.
In the embodiment of the present invention; the operating current of switching power devices B1 mates the operating current referring to switching power devices B1 more than presetting protective current in monocycle current control circuit with the protective current preset in monocycle current control circuit; that is to say that the operating current of switching power devices B1 is in over-current state; now; monocycle current control circuit stops signal to drive circuit transmission, can realize the overcurrent protection to switching power devices B1.Meanwhile; overcurrent protection signal can also be locked by monocycle current control circuit; monocycle current control circuit to overcurrent protection semaphore lock until next cycle pwm signal trigger till; after the pwm signal in next cycle triggers monocycle current control circuit; monocycle current control circuit can unlock overcurrent protection signal; and again drive switching power devices B1 to work by drive circuit, improve the reliability of switching power devices B1.
Further, described switching power devices B1 includes at least one power switch component, described power switch component is DBC(Direct Bonding Copper) on substrate or metal basal board equipped with the structure of at least one chip, or at metal basal board or PCB(Printed Circuit Board) be provided with the structure of at least one discrete power switching device on substrate.Described chip, discrete power switching device are full-control type semiconductor device or half control type semiconductor device.
Described is mainly that the chip structure installed dispels the heat at DBC substrate or metal basal board, full-control type semiconductor device or half control type semiconductor device is used to be the form of the power switch component that the art generally uses, referring to there are multiple power switch components in integrated form equipped with chip structure on DBC substrate or metal basal board, metal basal board typically can use aluminium base, copper base or iron substrate etc..
Further, described monocycle current control circuit includes at least one voltage comparator circuit and at least one flip-flop circuit, the outfan of described voltage comparator circuit is connected with the set end of flip-flop circuit, the outfan of flip-flop circuit is connected with drive circuit, and the reset terminal of flip-flop circuit is connected with pwm signal.
Wherein, voltage comparator circuit can use multiple discrete voltage comparator to constitute, it would however also be possible to employ the chip of integrated multiple voltage comparators, and concrete which kind of mode of employing is known to the art.Flip-flop circuit can use multiple digital gate circuit to be formed, it would however also be possible to employ standardized trigger.In the specific implementation, it is also possible to use the integrated circuit that voltage comparator circuit and flip-flop circuit integrate, or the discrete circuit form of voltage comparator circuit and flip-flop circuit.In voltage comparator circuit, the quantity of voltage comparator can carry out relative set according to the quantity of power switch component in switching power devices B1.
Default protective current in described monocycle current control circuit is directly set by voltage comparator circuit, or is adjusted according to the default protective current of the duty setting direct to voltage comparator circuit of switching power devices B1.In the embodiment of the present invention, it is adjusted according to working environment, the circuit working state of switching power devices B1, so that the maximum protection electric current of switching power devices B1 can regulate accordingly.
Described flip-flop circuit includes at least one trigger and signal processing circuit, the reset terminal of trigger receives pwm signal, the set end of trigger is connected with voltage comparator circuit, voltage comparator circuit includes at least one voltage comparator, the in-phase end of described voltage comparator is connected with the outfan of current sensing means, and an input of voltage comparator is connected with setting bleeder circuit.
In the embodiment of the present invention; the operating current of switching power devices B1 is compared by voltage comparator with the protective current of setting; when the operating current of switching power devices B1 is more than the protective current set; voltage comparator can be to flip-flop circuit output overcurrent signal; as long as voltage comparator circuit has over-current signal input; trigger all can drive to drive circuit transmission and stop signal, to avoid switching power devices B1 to be in stream duty.
Described current sensing means includes sampling resistor circuit or current transformer.Specifically, described current sensing means can be in the way of using switching power devices series resistor, the electric current in switching power devices is allowed to form voltage on resistance, for producing over-current signal after voltage comparator circuit, described current sensing means can also use the mode of current transformer, allow the electric current in switching power devices form voltage at the secondary of current transformer, compare generation over-current signal for voltage comparator circuit.Described current sensing means can in the way of using switching power devices integrated current detection pole, allow electric current in switching power devices B1 current detecting extremely on form voltage, compare generation over-current signal for voltage comparator circuit.Fig. 1 shows the enforcement connection that current sensing means includes sampling resistor R1, sampling resistor R2 and sampling resistor R3.
As in figure 2 it is shown, described current sensing means includes resistance R6, resistance R7 and resistance R8, monocycle current control circuit includes voltage comparator U1, voltage comparator U2, voltage comparator U3, trigger U4, resistance R4, resistance R5 and voltage VCC；nullPwm signal is connected with the reset terminal of trigger U4，The outfan of trigger U4 is connected with drive circuit，Voltage VCC、Resistance R4、Resistance R5 constitutes setting bleeder circuit，Voltage comparator U1、Voltage comparator U2、The outfan of voltage comparator U3 is connected with each set end of trigger U4，One input of voltage comparator U1、One input of voltage comparator U2 and an input of voltage comparator U3 are all connected with one end of resistance R4 and one end of resistance R5，The other end ground connection of resistance R5，The other end of resistance R4 is connected with voltage VCC，Another input of voltage comparator U1 is connected with one end of resistance R6，The other end ground connection of resistance R6，Another input of voltage comparator U2 is connected with one end of resistance R7，The other end ground connection of resistance R7，Another input of voltage comparator U3 is connected with one end of resistance R8，The other end ground connection of resistance R8.
In the specific implementation; the value of voltage VCC, resistance R4 and resistance R5 can set as required; it is thus possible to the input at voltage comparator U1, voltage comparator U2 and voltage comparator U3 obtains different magnitudes of voltage, different default protective currents can be formed.
nullWhen switching power devices B1 normally works，Sampling resistor R6、The voltage linearly proportional with the electric current in switching power devices B1 is all produced on sampling resistor R7 and sampling resistor R8，This voltage is separately input to voltage comparator U1、One input of voltage comparator U2 and voltage comparator U3，When normally working due to switching power devices B1，Sampling resistor R6、Voltage on sampling resistor R7 and sampling resistor R8 is less than voltage comparator U1、Voltage comparator U2 and the voltage of mono-input of voltage comparator U3，Therefore voltage comparator U1、Voltage comparator U2 and voltage comparator U3 all exports a fixing level，Drive circuit is allowed normally to work，Pwm signal controls switching power devices B1 and works continuously，Whole switching power devices B1 normal output power.
nullWhen at sampling resistor R6，Overcurrent signal is produced on arbitrary resistance in sampling resistor R7 and sampling resistor R8，All can make sampling resistor R6，Sampling resistor R7，Voltage on sampling resistor R8 raises，As sampling resistor R6，Sampling resistor R7，When in sampling resistor R8, arbitrary ohmically voltage is higher than the voltage of corresponding another input of voltage comparator，Corresponding voltage comparator reversion output and the most contrary level，The level change triggers trigger U4 of voltage comparator output，The output state of trigger U4 inverts and closes drive circuit，Switch off current in switching power devices B1，Protect switching power devices B1 not damage because producing overcurrent，Trigger U4 produces and latches overcurrent signal，Even if the electric current in switching power devices B1 has been lowered to normal current，Trigger U4 still can close drive circuit，Until the next pwm pulse cycle is interim，The rising edge of pwm signal is to trigger U4 reset signal，Trigger U4 output is made to recover normal level，Thus allow drive circuit works，Switching power devices B1 continues normal work.
As it is shown on figure 3, be the monocycle current-control power module embodiments of single sampling resistor, wherein, current sensing means includes that resistance R11, monocycle current control circuit include trigger U5, voltage comparator U6, resistance R9, resistance R10 and voltage VCC；Wherein, resistance R9, resistance R10 and voltage VCC are formed and set bleeder circuit, and voltage comparator U6 forms voltage comparator circuit, and trigger U5 forms flip-flop circuit.Pwm signal is connected with the reset terminal of trigger U5, the outfan of voltage comparator U6 is connected with the set end of trigger U5, one input of voltage comparator U6 is connected with one end, one end of resistance R10 of resistance R9, the other end ground connection of resistance R10, the other end of resistance R9 is connected with voltage VCC, another input of voltage comparator U6 is connected with one end of resistance R11, the other end ground connection of resistance R11, and one end of resistance R11 is also connected with switching power devices B1.
When switching power devices B1 normally works, generation and the electric current in switching power devices B1 voltage linearly on sampling resistor R11, this voltage is input to an input of voltage comparator U6, owing to the voltage on sampling resistor R11 during normal work is less than the voltage of voltage comparator another input of U6, therefore voltage comparator U6 exports a fixed level, drive circuit is allowed normally to work, pwm signal controls switching power devices B1 and works continuously, whole switching power devices B1 normal output power.
nullWhen the voltage on sampling resistor R11 is higher than the voltage of mono-input of voltage comparator U6，Voltage comparator U6 reversion output and the most contrary level，The change triggers trigger U5 of voltage comparator U6 output level，Trigger U5 reversion output and the most contrary level close drive circuit，Switch off current in switching power devices B1，Protect switching power devices B1 not damage because producing overcurrent，This trigger U5 can produce and latch overcurrent signal，Even if the electric current in switching power devices B1 has been lowered to normal current，Trigger U5 still can close drive circuit，Until the next pwm pulse cycle is interim，The rising edge of pwm signal is to trigger U4 reset signal，Make the level that the output of trigger U5 circuit is original，Thus allow drive circuit works，Switching power devices B1 continues normal work.
As shown in Figure 4, monocycle current-control power modular device embodiment for integrated sampling pole, wherein, described current sensing means includes resistance R14, resistance R15 and resistance R16, and monocycle current control circuit includes voltage comparator U7, voltage comparator U8, voltage comparator U9, trigger U10, resistance R12, resistance R13 and voltage VCC；Pwm signal is connected with the reset terminal of trigger U10, and the outfan of trigger U10 is connected with drive circuit；nullVoltage VCC、Resistance R12、Resistance R13 constitutes setting bleeder circuit，Voltage comparator U7、Voltage comparator U8、The outfan of voltage comparator U9 is connected with the set end of trigger U10，One input of voltage comparator U7、One input of voltage comparator U8 and an input of voltage comparator U9 are all connected with one end of resistance R12 and one end of resistance R13，The other end ground connection of resistance R13，The other end of resistance R12 is connected with voltage VCC，Another input of voltage comparator U7 is connected with one end of resistance R14，The other end ground connection of resistance R14，Another input of voltage comparator U8 is connected with one end of resistance R15，The other end ground connection of resistance R15，Another input of voltage comparator U9 is connected with one end of resistance R16，The other end ground connection of resistance R16.Switching power devices B1 is the power device with internal current detection device, and i.e. the power switch of switching power devices B1 is with current sample output stage.Resistance R14, resistance R15 and resistance R16 are connected respectively on the current sample output stage of switching power devices B1.
When switching power devices B1 normally works, sampling resistor R14, sampling resistor R15, voltage on sampling resistor R16 is separately input to voltage comparator U7, one input of voltage comparator U8 and voltage comparator U9, owing to the voltage on sampling resistor during normal work is less than the voltage of one input of voltage comparator, therefore voltage comparator U7, voltage comparator U8 and voltage comparator U8 all exports a fixed level, drive circuit is allowed normally to work, pwm signal controls switching power devices B1 and works continuously, whole switching power devices B1 normal output power.
nullWhen in switching power devices B1, arbitrary power switch produces overcurrent signal，All can make sampling resistor R14，Sampling resistor R15，Voltage on sampling resistor R16 raises，As sampling resistor R14、When voltage on sampling resistor R15 or sampling resistor R16 is higher than the voltage of corresponding voltage comparator input，Corresponding voltage comparator reversion output and the most contrary level，The change triggers trigger U10 of the output level of voltage comparator，Trigger U10 output and the most contrary level close drive circuit，Switch off current in switching power devices B1，Protect switching power devices B1 not damage because producing overcurrent，This trigger U10 can produce and latch overcurrent signal，Even if the electric current in switching power devices B1 has been lowered to normal current，Trigger U10 still can close drive circuit，Until the next pwm pulse cycle is interim，The rising edge of PWM input signal is to trigger U10 reset signal，Make the level that trigger U10 output is original，Thus allow drive circuit works，Switching power devices B1 continues normal work.
As shown in Figure 5, for regulating ratio compared with the monocycle current-control power modular device of voltage, current sensing means includes that resistance R19, monocycle current control circuit include trigger U11, voltage comparator U12, resistance R17, resistance R18, voltage comparator U13 and voltage VCC；Wherein, resistance R17, resistance R18 and voltage VCC are formed and set bleeder circuit, and voltage comparator U12 forms voltage comparator circuit, and trigger U11 forms flip-flop circuit.Pwm signal is connected with the reset terminal of trigger U11, the outfan of voltage comparator U12 is connected with the set end of trigger U11, one input of voltage comparator U12 is connected with one end, one end of resistance R18 of resistance R17, the other end ground connection of resistance R18, the other end of resistance R17 is connected with voltage VCC, another input of voltage comparator U12 is connected with one end of resistance R19, the other end ground connection of resistance R19, and one end of resistance R19 is also connected with switching power devices B1.One input of voltage comparator U12 also outfan with voltage comparator U13 is connected, and the end of oppisite phase of voltage comparator U13 is connected with the outfan of described voltage comparator U13, forms voltage follower.The in-phase end of voltage comparator U13 is connected with the comparison voltage of controller, additionally, panel can also detect the temperature signal of switching power devices B1.
When switching power devices B1 normally works, voltage on sampling resistor R19 is linearly proportional with the electric current in switching power devices B1, this voltage is input to an input of voltage comparator U12, owing to the voltage on sampling resistor R19 during normal work is less than the voltage of mono-input of voltage comparator U12, therefore voltage comparator U12 exports a fixed level, drive circuit is allowed normally to work, pwm signal controls switching power devices B1 and works continuously, whole switching power devices B1 normal output power.
When switching power devices B1 produces overcurrent signal; the voltage on sampling resistor R9 can be made to raise; when the voltage on resistance R19 is higher than the voltage of mono-input of voltage comparator U12; the level that voltage comparator U12 reversion output is contrary; the change triggers trigger U11 of voltage comparator U12 output level; trigger U12 output and the most contrary level close drive circuit; switch off current in switching power devices B1; protecting switching power devices B1 not damage because producing overcurrent, this trigger U11 can produce and latch overcurrent signal.Within this working cycle, even if the electric current in switching power devices B1 has been lowered to normal current, trigger U11 still can close drive circuit, until the next pwm pulse cycle is interim, the rising edge of pwm signal is to trigger U11 reset signal, making the level that trigger U11 output is original, thus allow drive circuit works, switching power devices B1 continues normal work.
When the ambient temperature of switching power devices B1 raises, the electric current allowable of switching power devices B1 can reduce, now according to the temperature current of switch module, volume characteristic curve should drop, the voltage of mono-input of voltage comparator U12 is reduced, now the maximum allowable electric current in switching power devices B1 also just reduces, thus ensure that switching power devices B1 can trouble free service in an environment of high temperature.When being embodied as, according to the temperature signal of switching power devices B1, reduce the voltage of mono-input of voltage comparator U12.Certainly, in the specific implementation, it is also possible to regulate the voltage of mono-input of voltage comparator U12 by other means, reach to regulate the purpose of default protective current.
After the present invention uses monocycle Current Control Technology; the electric current born in each working cycle in switching power devices B1 is by pwm signal control; once pwm signal is out of control; the electric current in switching power devices B1 is caused quickly to increase; over-current protection point quick closedown switching power devices B1 at switching power devices B1; thus protect switch module safely and reliably, improve the reliability of switching power devices B1.
Within a working cycle, when switching power devices B1 produces overcurrent, voltage comparator circuit and flip-flop circuit close and latch the drive circuit of switching power devices B1, allows and is no longer flow through electric current in switching power devices B1.The rising edge energy reset flip-flop circuit rapidly of the pwm signal of next cycle, unlocks overcurrent protection signal, makes pwm signal pass through drive circuit and drives switching power devices B1, allows switching power devices B1 normally work.
By the way of regulating ratio is compared with voltage, the overcurrent set point change of switching power devices B1 can be allowed.As when ambient temperature is higher, the maximum allowed current of general switch module can reduce, at this moment can be by being reduced by the comparison voltage of overcurrent set point, so that the maximum current flow through in switch module reduces the most accordingly, power model is reliably protected.
Claims (7)
1. a monocycle current-control power modular device, it is characterized in that: include the current sensing means for gathering switching power devices B1 operating current, described current sensing means is connected with monocycle current control circuit, the outfan of monocycle current control circuit is connected with the drive circuit of power model, and the input of monocycle current control circuit receives pwm signal；The operating current of the switching power devices B1 detected is transmitted to monocycle current control circuit by current sensing means；
When the operating current of described switching power devices B1 protective current default with monocycle current control circuit mates; monocycle current control circuit drives to drive circuit transmission and stops signal; to close switching power devices B1 by drive circuit, until the pwm signal in next cycle triggers monocycle current control circuit；After pwm signal triggers monocycle current control circuit, described monocycle current control circuit drives enabling signal to drive circuit transmission, to drive switching power devices B1 to work by drive circuit.
Monocycle current-control power modular device the most according to claim 1, it is characterized in that: described switching power devices B1 includes at least one power switch component, described power switch component is the structure on DBC substrate or metal basal board equipped with at least one chip, or is provided with the structure of at least one discrete power switching device on metal basal board or PCB substrate.
Monocycle current-control power modular device the most according to claim 2, is characterized in that: described chip, discrete power switching device are full-control type semiconductor device or half control type semiconductor device.
Monocycle current-control power modular device the most according to claim 1, it is characterized in that: described monocycle current control circuit includes at least one voltage comparator circuit and at least one flip-flop circuit, the outfan of described voltage comparator circuit is connected with the set end of flip-flop circuit, the outfan of flip-flop circuit is connected with drive circuit, and the reset terminal of flip-flop circuit is connected with pwm signal.
Monocycle current-control power modular device the most according to claim 1, is characterized in that: described current sensing means includes sampling resistor circuit or current transformer.
Monocycle current-control power modular device the most according to claim 4; it is characterized in that: the default protective current in described monocycle current control circuit is directly set by voltage comparator circuit, or is adjusted according to the default protective current of the duty setting direct to voltage comparator circuit of switching power devices B1.
Monocycle current-control power modular device the most according to claim 4, it is characterized in that: described flip-flop circuit includes that reset terminal can receive the trigger of at least one road pwm signal, the set end of trigger is connected with voltage comparator circuit, voltage comparator circuit includes at least one voltage comparator, one input of described voltage comparator is connected with the outfan of current sensing means, and another input of voltage comparator is connected with setting bleeder circuit；The outfan of voltage comparator connects the set end of trigger, trigger can be carried out set.
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| CN110021909A (en) * | 2019-03-26 | 2019-07-16 | 宁波安信数控技术有限公司 | A kind of pwm signal lock-in circuit of servo-driver |
| TWI721701B (en) * | 2019-12-10 | 2021-03-11 | 產晶積體電路股份有限公司 | Dynamic multifunctional power controller |
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