CN103728572A - Load test method and test circuit and switching power supply utilizing same - Google Patents
Load test method and test circuit and switching power supply utilizing same Download PDFInfo
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- CN103728572A CN103728572A CN201410012900.8A CN201410012900A CN103728572A CN 103728572 A CN103728572 A CN 103728572A CN 201410012900 A CN201410012900 A CN 201410012900A CN 103728572 A CN103728572 A CN 103728572A
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Abstract
The invention discloses a load test method and test circuit and a switching power supply utilizing the same. The voltage change between the first power end and the second power end of a synchronous rectifier switch arranged in the flyback switching power supply is monitored through the load test circuit and accordingly the switch state of a power switch tube arranged in the flyback switching power supply can be determined. When the power switch tube is located in the off state and the off state lasts till a preset time interval, the output end of the flyback switching power supply is located in the no load or light load state. In addition, an auxiliary power supply circuit supplies power for a synchronous rectifier control circuit and accordingly the synchronous rectifier control circuit is not large in power loss when a load is located in the no load or light load state.
Description
Technical field
The present invention relates to technical field of semiconductors, be specifically related to be used in load detecting method and the testing circuit of Switching Power Supply.
Background technology
Inverse-excitation type switch power-supply can be realized the isolation of former limit and secondary, and output voltage easily regulates, and at the secondary of inverse-excitation type switch power-supply, conventionally has a rectifier, take by the alternating voltage of transformer secondary winding or current conversion as the required DC voltage of load or electric current.In order to reduce the loss of rectifier, conventionally use the relatively low mos field effect transistor of conducting resistance as synchronous rectifier, the mode of this synchronous rectification can improve the conversion efficiency of power supply.
Be illustrated in figure 1 the circuit block diagram of a kind of inverse-excitation type switch power-supply of prior art, secondary has a switching tube Q2 as synchronous rectification switch, the on off state of rectifier control circuit 101 gauge tap pipe Q2, in rectifier control circuit, include synchronous rectification driving circuit and synchronous commutating control circuit, both directly power by output voltage.In addition, as shown in Figure 1, inverse-excitation type switch power-supply of the prior art characterizes the sampled voltage V of output voltage information with acquisition by diode D1 and resistor voltage divider network
off, by comparer, compare sampled voltage V afterwards
offwith the reference voltage V setting
rEF, as sampled voltage V
offlower than described reference voltage V
rEFtime, judge that described Switching Power Supply is in zero load or underloading.
According to the circuit diagram of the Switching Power Supply shown in Fig. 1, if Switching Power Supply under light condition, the power supply of synchronous commutating control circuit keeps power supply.Generally speaking, the supply voltage of synchronous commutating control circuit is in 3.0-3.5V left and right, and output voltage is in higher situation, as 12-19V left and right, the pressure reduction of this part can be larger, its power consumption of bringing also can be larger, and especially, under light condition, larger power consumption will produce very large impact to the efficiency of Switching Power Supply.
Summary of the invention
In view of this, the invention discloses a kind of load detecting method and testing circuit being applied in Switching Power Supply, by load detecting circuit, detect the voltage between the first power end and the second power end of synchronous rectification switch, to judge accordingly the on off state of power switch pipe in described inverse-excitation type switch power-supply, when described power switch pipe is in off state, and when off state lasts till default time interval, judge that the output of described inverse-excitation type switch power-supply is in zero load or light condition.
According to the load detecting method of a kind of Switching Power Supply of the present invention, be applied in inverse-excitation type switch power-supply,
Monitor the voltage between the first power end and the second power end of the synchronous rectification switch in described inverse-excitation type switch power-supply,
According to the change in voltage between the first power end of described synchronous rectification switch and the second power end, judge the on off state of power switch pipe in described inverse-excitation type switch power-supply, wherein,
When described power switch pipe is in off state, and off state is while lasting till default time interval, judges that the output of described inverse-excitation type switch power-supply is in zero load or light condition.
Preferably, sample and keep the voltage between the first power end and the second power end of described synchronous rectification switch, obtaining a sampling and keep voltage;
When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is less than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting decline state;
When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is greater than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting propradation.
Preferably, when the voltage between the first power end and the second power end of described synchronous rectification switch starts to rise, characterize described power switch pipe and start conducting;
When the voltage between the first power end and the second power end of described synchronous rectification switch starts to decline, characterize described power switch pipe and start to turn-off.
Preferably, the off state that judges described power switch pipe lasts till that the concrete steps of default time interval comprise:
Utilize a charging current to charge to an electric capacity, utilize the charging and discharging state of electric capacity described in gate-controlled switch control, the both end voltage of described electric capacity is as ramp voltage, and wherein, the on off state of described gate-controlled switch is identical with the on off state of described power switch pipe;
When described gate-controlled switch disconnects, described ramp voltage continues to rise, and the off state that the time that described ramp voltage rises to default voltage threshold is described power switch pipe lasts till default time interval.
According to the load detecting circuit of a kind of Switching Power Supply of the present invention, be applied in inverse-excitation type switch power-supply,
Described load detecting circuit is monitored the voltage between the first power end and the second power end of the synchronous rectification switch in described inverse-excitation type switch power-supply, and according to the change in voltage between the first power end of described synchronous rectification switch and the second power end, judge the on off state of power switch pipe in described inverse-excitation type switch power-supply
Wherein, when described power switch pipe is in off state, and off state is while lasting till default time interval, judges that the output of described inverse-excitation type switch power-supply is in zero load or light condition.
Further, described load detecting circuit comprises voltage sampling circuit, and voltage sampling circuit comprises sampling hold circuit and comparator circuit,
Described sampling hold circuit is sampled and is kept the voltage between the first power end and the second power end of described synchronous rectification switch, obtains a sampling and keeps voltage;
Voltage between the first power end and the second power end of the described synchronous rectification switch of the more described sampling maintenance voltage of described comparator circuit and real-time sampling,
When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is less than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting decline state; When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is greater than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting propradation.
Further, when the voltage between the first power end and the second power end of described synchronous rectification switch starts to rise, characterize described power switch pipe and start conducting;
When the voltage between the first power end and the second power end of described synchronous rectification switch starts to decline, characterize described power switch pipe and start to turn-off.
Further, described load detecting circuit further comprises charge-discharge circuit and status signal circuit for generating,
Described charge-discharge circuit comprises current source and the electric capacity of series connection, and with the gate-controlled switch of Capacitance parallel connection, gate-controlled switch is by its switch motion of output signal control of comparator circuit, the both end voltage of charging capacitor is ramp voltage, when described gate-controlled switch disconnects, described ramp voltage continues to rise;
Described status signal circuit for generating receives described ramp voltage and a default voltage threshold, and when described ramp voltage rises to described voltage threshold, status signal circuit for generating produces the status signal of a sign load information.
According to a kind of inverse-excitation type switch power-supply of the present invention, comprise power stage circuit, rectifier control circuit and above-mentioned load detecting circuit,
The output signal of described load detecting circuit is transferred to described rectifier control circuit;
Described rectifier control circuit is in order to control the on off state of synchronous rectification switch in described power stage circuit, and it comprises synchronous commutating control circuit and synchronous rectification driving circuit, and utilizes auxiliary power supply circuit to power to described synchronous commutating control circuit.
Further, described auxiliary power supply circuit comprise with described inverse-excitation type switch power-supply in transformer-coupled auxiliary winding, commutation diode and the first electric capacity.
Above-mentioned load detecting circuit is monitored the voltage between the first power end and the second power end of the synchronous rectification switch in inverse-excitation type switch power-supply by load detecting circuit, to judge accordingly the on off state of power switch pipe in described inverse-excitation type switch power-supply, when described power switch pipe is in off state, and when off state lasts till default time interval, judge that the output of described inverse-excitation type switch power-supply is in zero load or light condition.In addition, in the present invention, adopt auxiliary power supply circuit to power to synchronous commutating control circuit, when load is during in zero load or light condition, synchronous commutating control circuit power supply can be lower, can not produce larger power attenuation, with respect to prior art, open circuit loss can reduce greatly.
Accompanying drawing explanation
Figure 1 shows that the circuit block diagram of a kind of inverse-excitation type switch power-supply of prior art;
Figure 2 shows that the circuit block diagram according to a kind of inverse-excitation type switch power-supply of the present invention;
Figure 3 shows that a kind of specific implementation circuit diagram according to load detecting circuit of the present invention;
Figure 4 shows that the working waveform figure according to inverse-excitation type switch power-supply of the present invention;
Embodiment
Below in conjunction with accompanying drawing, several preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiment.The present invention contain any in marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.In order to make the public that the present invention is had thoroughly and be understood, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have for a person skilled in the art the description of these details also can understand the present invention completely.
With reference to the circuit block diagram Figure 2 shows that according to a kind of inverse-excitation type switch power-supply of the present invention, in the present embodiment, switching tube Q1 is power switch pipe, the on off state control input end of switching tube Q1 transfers to the energy of output terminal, switching tube Q2 is as the synchronous rectification switch of secondary, the on off state of rectifier control circuit 201 gauge tap pipe Q2, in rectifier control circuit, include synchronous rectification driving circuit 201-1 and synchronous commutating control circuit 201-2, synchronous rectification driving circuit 201-1 is directly powered by output voltage, synchronous commutating control circuit 201-2 is powered by auxiliary power supply circuit 203.
As shown in Figure 2, described inverse-excitation type switch power-supply also comprises load detecting circuit 202, load detecting circuit 202 specifically comprises voltage sampling circuit 202-1, charge-discharge circuit 202-2 and status signal produce circuit 202-3, voltage sampling circuit 202-1, a kind of specific implementation of charge-discharge circuit 202-2 and status signal generation circuit 202-3 as shown in Figure 3, described voltage sampling circuit 202-1 comprises sampling hold circuit and comparator circuit, comparator circuit is specially comparator C MP1, described sampling hold circuit is sampled and is kept the voltage between the first power end and the second power end of described synchronous rectification switch, obtain a sampling and keep voltage Vs, here, described the first power end is the drain electrode of switching tube Q2, described the second power end is the source electrode of switching tube Q2, and source electrode connects with reference to ground, the voltage between the first power end and the second power end of the described synchronous rectification switch of the more described sampling maintenance voltage Vs of described comparator circuit and real-time sampling is drain-source voltage V
dS.
When comparator C MP1 compares voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains and is less than described sampling and keeps voltage Vs, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting decline state; When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is greater than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting propradation.Comparator C MP1 output comparison signal Vc is transferred to charge-discharge circuit, and has, as drain-source voltage V
dSwhile being less than described sampling maintenance voltage Vs, described comparison signal Vc is low level state, as drain-source voltage V
dSwhile being greater than described sampling maintenance voltage Vs, described comparison signal Vc is high level state.
Afterwards, the turn-off time of power switch pipe Q1 described in described charge-discharge circuit 202-2 timing, be specially, described charge-discharge circuit 202-2 comprises current source Is and the capacitor C 1 of series connection, and with the controllable switch S 1 of Capacitance parallel connection, controllable switch S 1 is controlled its switch motion by comparison signal Vc, controllable switch S 1 conducting when comparison signal Vc is high level state, and when described comparison signal Vc is low level state, the controlled S1 that opens disconnects.The both end voltage of charging capacitor is ramp voltage V
ramp, when described gate-controlled switch disconnects, described ramp voltage V
rampcontinue to rise.
Status signal circuit for generating 202-3 specifically comprises a comparator C MP2, and comparator C MP2 receives described ramp voltage V
rampwith a default voltage threshold V
th, when described ramp voltage rises to described voltage threshold, status signal circuit for generating produces the status signal of a sign load information, and described status signal transmission is given described synchronous commutating control circuit 201-2.。Generally speaking, user can require to set Preset Time interval according to the judgement of switch periods and zero load or underloading, for example, Preset Time interval is made as to the N of former limit power switch pipe normal workweek phase doubly, and for example 4 times, described ramp voltage V
rampfrom the voltage threshold V that rises to above freezing
thtime be the Preset Time interval of the turn-off time of described power switch pipe, therefore, described voltage threshold is configured such that ramp voltage V
rampthe time interval rising meets above-mentioned requirements.When the turn-off time of described power switch pipe reaches described Preset Time interval, characterize described load in zero load or light condition.
From said process, can learn, when power switch pipe Q1 disconnects, drain-source voltage V
dSstart to decline, comparison signal Vc becomes low level state, and therefore, controllable switch S 1 disconnects, in like manner, controllable switch S 1 conducting during power switch pipe Q1 conducting, therefore, the on off state of described controllable switch S 1 is identical with the on off state of described power switch pipe Q1.
Below with reference to the working waveform figure according to inverse-excitation type switch power-supply of the present invention shown in Fig. 4, as shown in Figure 4, in the t1 moment, when inverse-excitation type switch power-supply is under zero load or light condition, output current I
outmeeting reduces or is zero, and former limit circuit enters the mode of operation of having the hiccups, the switch controlling signal V of former limit power switch pipe Q1
gatewaveform as shown in Figure 4, according to the principle of work of inverse-excitation type switch power-supply, when the power switch pipe Q1 on former limit starts conducting, the drain-source voltage V of synchronous rectification switch
dSstart to rise, after the complete conducting of power switch pipe Q1, drain-source voltage V
dSremain I × R
dSproduct value, I is by the current value of switching tube Q2, R
dSfor the conducting resistance of switching tube Q2; When the power switch pipe Q1 on former limit starts to turn-off, the drain-source voltage V of synchronous rectification switch
dSstart to decline, at power switch pipe, Q1 completely closes and has no progeny, drain-source voltage V
dSclose to null value.The drain-source voltage V of secondary synchronous rectification switch
dSwaveform as shown in Figure 4.According to the principle of work of above-mentioned load detecting circuit, ramp voltage V
rampthe time and the switch controlling signal V that rise
gatethe low level time corresponding.Until the t2 moment, the turn-off time of power switch pipe lasts till that after default time interval, status signal becomes high level, judge described inverse-excitation type switch power-supply in zero load or light condition.Therefore,, by the load detecting circuit of the embodiment of the present invention, by the drain-source voltage that detects synchronous rectification switch, can realize the judgement to load condition.
It should be added that, in the present invention auxiliary power supply circuit 203 comprise with described inverse-excitation type switch power-supply in transformer-coupled auxiliary winding, commutation diode with the first electric capacity.Auxiliary power supply circuit 203 can provide supply voltage according to the expectation driving voltage of synchronous commutating control circuit 201-2, for example 5V, in the higher situation of output voltage, for example 12-19V, when zero load or light condition, the power consumption that synchronous commutating control circuit produces reduces greatly with respect to prior art.Those skilled in the art can know by inference, and in the situation that output voltage is lower, auxiliary power supply circuit 203 can be given synchronous rectification driving circuit 201-1 power supply, and output voltage is directly given synchronous commutating control circuit 201-2 power supply.
Above-mentioned load detecting circuit changes to judge the load condition of output terminal by detecting the drain-source voltage of synchronous rectification switch, without output voltage is sampled and compare operation, control program is simple, effective.
The invention also discloses a kind of load detecting method being applied in Switching Power Supply, comprise the following steps:
Monitor the voltage between the first power end and the second power end of the synchronous rectification switch in described inverse-excitation type switch power-supply,
According to the change in voltage between the first power end of described synchronous rectification switch and the second power end, judge the on off state of power switch pipe in described inverse-excitation type switch power-supply, wherein,
When described power switch pipe is in off state, and off state is while lasting till the default time, judges that described inverse-excitation type switch power-supply is in zero load or light condition.
Further, sample and keep the voltage between the first power end and the second power end of described synchronous rectification switch, obtaining a sampling and keep voltage;
When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is less than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting decline state;
When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is greater than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting propradation.
Further, when the voltage between the first power end and the second power end of described synchronous rectification switch starts to rise, characterize described power switch pipe and start conducting;
When the voltage between the first power end and the second power end of described synchronous rectification switch starts to decline, characterize described power switch pipe and start to turn-off.
In sum, load detecting circuit of the present invention is the voltage between the first power end and the second power end to the synchronous rectification switch in inverse-excitation type switch power-supply by load detecting circuit, to judge accordingly the on off state of power switch pipe in described inverse-excitation type switch power-supply, when described power switch pipe is in off state, and when off state lasts till default time interval, judge that the output of described inverse-excitation type switch power-supply is in zero load or light condition.In addition, in the present invention, adopt auxiliary power supply circuit to power to rectifier control circuit, when load is during in zero load or light condition, synchronous commutating control circuit power supply can be lower, can not produce larger power attenuation, with respect to prior art, open circuit loss can reduce greatly.
Above load detecting method, testing circuit according to the preferred embodiments of the present invention and the Switching Power Supply of applying it have been carried out to detailed description, those of ordinary skills can know accordingly other technologies or structure and circuit layout, element etc. by inference and all can be applicable to described embodiment.
According to embodiments of the invention as described above, these embodiment do not have all details of detailed descriptionthe, and also not limiting this invention is only described specific embodiment.Obviously, according to above description, can make many modifications and variations.These embodiment are chosen and specifically described to this instructions, is in order to explain better principle of the present invention and practical application, thereby under making, technical field technician can utilize the present invention and the modification on basis of the present invention to use well.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (10)
1. a load detecting method, is applied in inverse-excitation type switch power-supply, it is characterized in that,
Monitor the voltage between the first power end and the second power end of the synchronous rectification switch in described inverse-excitation type switch power-supply,
According to the change in voltage between the first power end of described synchronous rectification switch and the second power end, judge the on off state of power switch pipe in described inverse-excitation type switch power-supply, wherein,
When described power switch pipe is in off state, and off state is while lasting till default time interval, judges that the output of described inverse-excitation type switch power-supply is in zero load or light condition.
2. load detecting method according to claim 1, is characterized in that,
Sample and keep the voltage between the first power end and the second power end of described synchronous rectification switch, obtaining a sampling and keep voltage;
When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is less than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting decline state;
When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is greater than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting propradation.
3. load detecting method according to claim 2, is characterized in that,
When the voltage between the first power end and the second power end of described synchronous rectification switch starts to rise, characterize described power switch pipe and start conducting;
When the voltage between the first power end and the second power end of described synchronous rectification switch starts to decline, characterize described power switch pipe and start to turn-off.
4. load detecting method according to claim 1, is characterized in that, judges that the off state of described power switch pipe lasts till that the concrete steps of default time interval comprise:
Utilize a charging current to charge to an electric capacity, utilize the charging and discharging state of electric capacity described in gate-controlled switch control, the both end voltage of described electric capacity is as ramp voltage, and wherein, the on off state of described gate-controlled switch is identical with the on off state of described power switch pipe;
When described gate-controlled switch disconnects, described ramp voltage continues to rise, and the off state that the time that described ramp voltage rises to default voltage threshold is described power switch pipe lasts till default time interval.
5. a load detecting circuit, is applied in inverse-excitation type switch power-supply, it is characterized in that,
Described load detecting circuit is monitored the voltage between the first power end and the second power end of the synchronous rectification switch in described inverse-excitation type switch power-supply, and according to the change in voltage between the first power end of described synchronous rectification switch and the second power end, judge the on off state of power switch pipe in described inverse-excitation type switch power-supply
Wherein, when described power switch pipe is in off state, and off state is while lasting till default time interval, judges that the output of described inverse-excitation type switch power-supply is in zero load or light condition.
6. load detecting circuit according to claim 5, is characterized in that, described load detecting circuit comprises voltage sampling circuit, and voltage sampling circuit comprises sampling hold circuit and comparator circuit,
Described sampling hold circuit is sampled and is kept the voltage between the first power end and the second power end of described synchronous rectification switch, obtains a sampling and keeps voltage;
Voltage between the first power end and the second power end of the described synchronous rectification switch of the more described sampling maintenance voltage of described comparator circuit and real-time sampling,
When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is less than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting decline state; When the voltage between the first power end and the second power end of described synchronous rectification switch that real-time sampling obtains is greater than described sampling and keeps voltage, judge that voltage between the first power end and the second power end of described synchronous rectification switch is in starting propradation.
7. load detecting circuit according to claim 6, is characterized in that,
When the voltage between the first power end and the second power end of described synchronous rectification switch starts to rise, characterize described power switch pipe and start conducting;
When the voltage between the first power end and the second power end of described synchronous rectification switch starts to decline, characterize described power switch pipe and start to turn-off.
8. load detecting circuit according to claim 6, is characterized in that, described load detecting circuit further comprises charge-discharge circuit and status signal circuit for generating,
Described charge-discharge circuit comprises current source and the electric capacity of series connection, and with the gate-controlled switch of Capacitance parallel connection, gate-controlled switch is by its switch motion of output signal control of comparator circuit, the both end voltage of charging capacitor is ramp voltage, when described gate-controlled switch disconnects, described ramp voltage continues to rise;
Described status signal circuit for generating receives described ramp voltage and a default voltage threshold, and when described ramp voltage rises to described voltage threshold, status signal circuit for generating produces the status signal of a sign load information.
9. an inverse-excitation type switch power-supply, is characterized in that, comprises the load detecting circuit described in power stage circuit, rectifier control circuit and the claims 5-8 any one,
The output signal of described load detecting circuit is transferred to described rectifier control circuit;
Described rectifier control circuit is in order to control the on off state of synchronous rectification switch in described power stage circuit, and it comprises synchronous commutating control circuit and synchronous rectification driving circuit, and utilizes auxiliary power supply circuit to power to described synchronous commutating control circuit.
10. inverse-excitation type switch power-supply according to claim 9, is characterized in that, described auxiliary power supply circuit comprise with described inverse-excitation type switch power-supply in transformer-coupled auxiliary winding, commutation diode and the first electric capacity.
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