CN102709871A - Impulse current inhibiting circuit and supply circuit - Google Patents
Impulse current inhibiting circuit and supply circuit Download PDFInfo
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- CN102709871A CN102709871A CN2012102171392A CN201210217139A CN102709871A CN 102709871 A CN102709871 A CN 102709871A CN 2012102171392 A CN2012102171392 A CN 2012102171392A CN 201210217139 A CN201210217139 A CN 201210217139A CN 102709871 A CN102709871 A CN 102709871A
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Abstract
The invention discloses an impulse current inhibiting circuit and a supply circuit; when a constant current source is transformed into loaded state from unloaded state, a first control unit detects the output current of a main circuit of the constant current source and controls a first output switch to turn off and the main circuit of the constant current source to shutdown when the output current is no less than a predetermined current threshold value; a first discharge unit detects the predetermined parameter of the circuit and discharges an output capacitor when the predetermined parameter satisfies the discharge condition, namely the first discharge unit discharges the output capacitor when the impulse current exists in the supply circuit; the constant current source re-starts again at loaded state when the charge on the output capacitor is discharged to a certain degree, the voltage on the output capacitor slowly increases from a lower set value without occurring the impulse current. According to the technical scheme, the impulse current problem caused by the voltage instantaneous discharge on the output capacitor in the transformation process of the constant current source from unloaded state to loaded state is solved.
Description
Technical field
The application relates to circuit field, relates in particular to a kind of circuit and power supply circuits that suppress impulse current.
Background technology
The Switching Power Supply of constant current output is also referred to as constant-current source.Constant-current source can be operated in Light Condition, also can be operated in band and carry state.
Circuit structure when the constant-current source band carries is as shown in Figure 1, comprise constant-current source main circuit 110, be serially connected with output capacitance Co and load 120 between two outputs of main circuit;
Generally speaking, the output voltage during the constant-current source unloaded operation is higher than the load-carrying voltage of constant-current source.In circuit shown in Figure 1; When constant-current source when Light Condition switches to band and carries state, because the voltage on the output capacitance Co is higher than the voltage of load, therefore; The process of the switching of constant-current source from Light Condition to band year state; Rapidly discharge of the electric charge of Co on the output capacitance causes instantaneously having too high impulse current to flow through load, and this just damages load easily or shortens its life-span.
Summary of the invention
In view of this; The technical problem that the application will solve is; A kind of circuit and power supply circuits that suppress impulse current are provided, can solve constant-current source and switch to the impulse current problem that the voltage instantaneous discharge on the output capacitance causes the process of being with the state of carrying from Light Condition.
For this reason, the application embodiment adopts following technical scheme:
The application embodiment provides a kind of circuit that suppresses impulse current; This circuit application is in power supply circuits; Said power supply circuits comprise: output capacitance is serially connected with between two outputs of constant-current source main circuit, and load strings is connected between two outputs of constant-current source main circuit; The circuit of this inhibition impulse current comprises:
The first output switch, first end of the said first output switch connects the negative output of main circuit, and second end of the first output switch connects the negative-phase input of load, and control end connects an output of first control unit;
First control unit is used to detect the output current of constant-current source main circuit, and when confirming said output current greater than the predetermined current threshold value, the control first output switch turn-offs, the main circuit shutdown of control constant-current source;
First discharge cell is serially connected with between the two ends of output capacitance; First discharge cell is used for the parameter preset of testing circuit, when confirming that parameter preset satisfies discharging condition, is the output capacitance discharge, when confirming that parameter preset does not satisfy discharging condition, stops to be the output capacitance discharge; Said discharging condition is used for confirming that constant-current source switches to the process that band carries state from Light Condition, has impulse current in the power supply circuits;
Said first control unit also is used for: detect first end of the first output switch and the switching voltage between second end, and when confirming said switching voltage less than first voltage threshold, the control first output switch conduction, the start of control main circuit.
Said parameter preset is the on-off state of main circuit, and said discharging condition is that main circuit is in off-mode; First discharge cell specifically is used for: detecting the on-off state of main circuit, when the on-off state of confirming main circuit is off-mode, is the output capacitance discharge, and when the on-off state of confirming main circuit was open state, stopping was the output capacitance discharge.
Said first discharge cell comprises:
First discharge resistance and first discharge switch are serially connected with the two ends of output capacitance;
The rectifying and wave-filtering subelement, two corresponding respectively two ends that connect Transformer Winding in the main circuit of input are used for the voltage at Transformer Winding two ends is carried out the rectifying and wave-filtering processing, with the rectifying and wave-filtering signal input inversion subelement that obtains;
The anti-phase subelement is used for that the rectifying and wave-filtering signal is carried out anti-phase and handles, and the inversion signal that obtains is exported to the control end of first discharge switch.
Said first discharge cell comprises:
First discharge resistance and first discharge switch are serially connected with the two ends of output capacitance;
The rectifying and wave-filtering subelement, two corresponding respectively two ends that connect Transformer Winding in the main circuit of input are used for the voltage at Transformer Winding two ends is carried out the rectifying and wave-filtering processing, the rectifying and wave-filtering signal that obtains are exported to the control end of discharge switch.
Said parameter preset is first end of the first output switch and the switching voltage between second end, and said discharging condition is that switching voltage is not less than second voltage threshold; First discharge cell specifically is used for: detect first end of the first output switch and the switching voltage between second end, when confirming that said switching voltage is not less than second voltage threshold, be the output capacitance discharge; When confirming said switching voltage, stop to be the output capacitance discharge less than second voltage threshold.
Said first discharge cell comprises:
Second discharge resistance and second discharge switch are serially connected with the two ends of output capacitance, and the control end of second discharge switch connects second end of the first output switch.
Said first control unit comprises:
First end of sampling resistor connects the negative output of main circuit; Second end of sampling resistor connects first end of the first output switch, is connected second end of the first output switch with second resistance through first resistance of serial connection, also the negative-phase input through first resistance connection comparator; The normal phase input end received current threshold value of comparator, output connect the control end of the first output switch, connect the on-off state control end of main circuit through the diode of reversal connection.
The application embodiment also provides a kind of circuit that suppresses impulse current; This circuit application is in power supply circuits; Said power supply circuits comprise: output capacitance is serially connected with between two outputs of constant-current source main circuit, and load strings is connected between two outputs of constant-current source main circuit; The circuit of this inhibition impulse current comprises:
The second output switch, first end of the said second output switch connects the negative output of main circuit, and second end connects the negative-phase input of load, and control end connects an output of second control unit;
Second control unit is used to detect the output current of constant-current source main circuit, and when confirming said output current greater than the predetermined current threshold value, the control second output switch turn-offs, the main circuit shutdown of control constant-current source, and controlling second discharge cell is the output capacitance discharge;
Second discharge cell is used under the control of second control unit, being the output capacitance discharge;
Second control unit also is used for: detect first end of the second output switch and the switching voltage between second end; When confirming said switching voltage less than first voltage threshold; The control second output switch conduction, the start of control main circuit is controlled second discharge cell and is stopped to be the output capacitance discharge;
Second discharge cell also is used for: under the control of second control unit, stop to be the output capacitance discharge.
Said second discharge cell comprises:
The 3rd discharge resistance and the 3rd discharge switch are serially connected with the two ends of output capacitance; The control end of the 3rd discharge switch connects an output of second control unit, and perhaps, the control end of the 3rd discharge switch connects the output of anti-phase subelement, and the input of anti-phase subelement connects an output of second control unit.
Said second control unit comprises:
First end of sampling resistor connects the negative output of main circuit; Second end of sampling resistor connects first end of the second output switch, is connected second end of the second output switch with second resistance through first resistance of serial connection, also the negative-phase input through first resistance connection comparator; The normal phase input end received current threshold value of comparator; The output of comparator connects the control end of the second output switch, connects the on-off state control end of main circuit through the diode of reversal connection, also connects an input of second discharge cell.
The application embodiment also provides a kind of power supply circuits, comprising: output capacitance is serially connected with between two outputs of constant-current source main circuit, and load strings is connected between two outputs of constant-current source main circuit; Also comprise: the circuit of above-mentioned each described inhibition impulse current.
Technique effect analysis for technique scheme is following:
When constant-current source when Light Condition changes band over to and carries state; First control unit detects the output current of constant-current source main circuit; When confirming said output current greater than the predetermined current threshold value; The control first output switch turn-offs, the main circuit shutdown of control constant-current source, thus guarantee that main circuit no longer continues to power to the load; The parameter preset of the first discharge cell testing circuit when confirming that parameter preset satisfies discharging condition, is the output capacitance discharge; Said discharging condition is used for confirming that constant-current source switches to the process that band carries state from Light Condition, has impulse current in the power supply circuits, when also promptly in confirming power supply circuits, having impulse current; Be the output capacitance discharge, the charge discharge on output capacitance arrives to a certain degree, when also promptly first control unit is confirmed said switching voltage less than first voltage threshold; The first output switch conduction; Constant-current source is with once more to carry and is started, and the voltage on the output capacitance begins slow increase from lower set point, impulse current no longer occurs.Therefore; The present techniques scheme is carried the handoff procedure of state at constant-current source from Light Condition to band; Realized charge discharge on the output capacitance; Eliminated said impulse current, solved constant-current source and switched to the impulse current problem that the voltage instantaneous discharge on the output capacitance causes the process of being with the state of carrying, reduced the loss of impulse current load from Light Condition.
Description of drawings
Fig. 1 is prior art power supply circuit construction figure;
Fig. 2 suppresses circuit first embodiment of impulse current for the application;
Fig. 3 suppresses circuit second embodiment of impulse current for the application;
Fig. 4 suppresses circuit the 3rd embodiment of impulse current for the application;
Fig. 5 suppresses circuit the 4th embodiment of impulse current for the application;
Fig. 6 suppresses circuit the 5th embodiment of impulse current for the application;
Fig. 7 suppresses circuit the 6th embodiment of impulse current for the application;
Fig. 8 suppresses circuit the 7th embodiment of impulse current for the application;
Fig. 9 suppresses circuit the 8th embodiment of impulse current for the application;
Figure 10 suppresses circuit the 9th embodiment of impulse current for the application.
Embodiment
The circuit of the said inhibition impulse current of the application goes in the power supply circuits shown in Figure 1; Wherein, The main circuit 110 and the output capacitance Co of constant-current source all belongs to the part of constant-current source, and the main circuit implementation structure whether constant-current source comprises other structures, constant-current source does not limit here.Among the application, in the input with load, the input that is connected with the positive output end of main circuit is called normal phase input end, and the input that is connected with the negative output of main circuit is called negative-phase input.The connection here can be for directly connecting or connecting indirectly through other devices in the circuit such as resistance, switch.
Fig. 2 suppresses circuit structure first embodiment of impulse current for the application, and said circuit comprises:
The first output switch S o1; First end of the said first output switch S o1 connects the negative output of main circuit 110; Second end of the first output switch S o1 connects the negative-phase input of load 120, and the control end of the first output switch S o1 connects an output of first control unit 210; This output is used for exporting the control signal of first control unit 210 for the first output switch S o1 to the first output switch S o1, to control conducting or the shutoff of the first output switch S o1.
As shown in Figure 2; Said first control unit 210 can also be used for: detect the switching voltage between first output switch S o1 first end and second end; When confirming said switching voltage less than first voltage threshold, the control first output switch S o1 conducting, 110 starts of control main circuit.Output voltage when described first voltage threshold does not connect load less than main circuit and load voltage poor.
General, first control unit 210 can transmit control signal to controlled object through output, realizes the control to said object.For example, first output of first control unit 210 connects the control end of the first output switch S o1, and second output connects the on-off state control end of main circuit; Thereby; First control unit 210 sends the control signal of control first output switch S o1 conducting or shutoff to the first output switch S o1 through first output; Realize control first output switch S o1 conducting or the shutoff; Send start or close machine control signal through the corresponding input of second output to main circuit; Realize start of control main circuit or shutdown, send the control signal that control first discharge cell stops to discharge to first discharge cell, realize that control first discharge cell stops discharge through the 3rd output.
Wherein, First control unit 210 is to the first output switch S o1, when main circuit is controlled; Can transmit control signal to these Be Controlled objects simultaneously and control, also can successively transmit control signal and control, not limit here to these Be Controlled objects.
The circuit of inhibition impulse current shown in Figure 2; When constant-current source when Light Condition changes band over to and carries state; First control unit detects the output current of constant-current source main circuit 110, and when confirming said output current greater than the predetermined current threshold value, the control first output switch S o1 turn-offs; Main circuit 110 shutdown of control constant-current source, thus guarantee that main circuit no longer continues to output capacitance Co and load 120 power supplies; The parameter preset of first discharge cell, 220 testing circuits when confirming that parameter preset satisfies discharging condition, is output capacitance Co discharge; Said discharging condition is used for confirming that constant-current source switches to the process that band carries state from Light Condition; There is impulse current in the power supply circuits, when also promptly in confirming power supply circuits, having impulse current, is output capacitance Co discharge; Thereby eliminated the electric charge on the output capacitance Co, eliminated said impulse current; And then first control unit 210 detects the switching voltage between first output switch S o1 first end and second end, when confirming said switching voltage less than first voltage threshold; The control first output switch S o1 conducting; The start of control main circuit 110, first discharge cell detect parameter preset not to be satisfied discharging condition and stops the discharge for output capacitance Co, like this; After the electric charge on the output capacitance Co is released; Main circuit 110 is with again to carry and is opened machine, and the voltage on the output capacitance Co begins slow increase from lower set point, impulse current no longer occurs.Thereby the application embodiment has solved constant-current source and has switched to the impulse current problem that the voltage instantaneous discharge on the output capacitance causes the process that band carries state from Light Condition, has avoided load to accept too high impulse current and damage or shorten the life-span.
Wherein, the said parameter preset that first discharge cell 220 detects can be on-off state or first end of the first output switch and the switching voltage between second end etc. of main circuit, below describes through Fig. 3 and Fig. 4 respectively.
Fig. 3 suppresses circuit implementation structure second embodiment of impulse current for the application.Under the circuit structure shown in Figure 3, said parameter preset can be the on-off state of main circuit, and corresponding, said discharging condition can be in off-mode for main circuit; Accordingly; First discharge cell 220 specifically can be used for: detecting the on-off state of main circuit, when the on-off state of confirming main circuit is off-mode, is the output capacitance discharge; When the on-off state of confirming main circuit was open state, stopping was the output capacitance discharge.As shown in Figure 3; The test side of first discharge cell 220 is connected with main circuit 110, and is concrete, two test sides of first discharge cell 220 can with the corresponding connection in the two ends of Transformer Winding in the main circuit 110; When the voltage that detects the winding two ends was zero, then main circuit was in off-mode; Otherwise main circuit is in open state.
Fig. 4 suppresses circuit the 3rd embodiment of impulse current for the application; Under circuit structure shown in Figure 4; Said parameter preset can be first end of the first output switch S o1 and the switching voltage between second end, and corresponding, said discharging condition can be not less than second voltage threshold for switching voltage; Accordingly; First discharge cell 220 specifically can be used for: detect first end of the first output switch and the switching voltage between second end; When confirming that said switching voltage is not less than second voltage threshold; Be the output capacitance discharge, when confirming said switching voltage, stop to be the output capacitance discharge less than second voltage threshold.As shown in Figure 4, the test side of first discharge cell 220 can be connected with second end of the first output switch, realizes the detection for the switching voltage of the first output switch.
Output voltage when described second voltage threshold does not connect load less than main circuit and present load voltage poor.
Fig. 5 suppresses circuit the 4th embodiment of impulse current for the application.Compared to embodiment illustrated in fig. 2, difference only is: Fig. 5 shows a kind of implementation structure of first control unit among Fig. 2.The implementation structure of first control unit can also be applied among the corresponding embodiment of Fig. 3 or Fig. 4 among Fig. 5, for example Fig. 6 ~ shown in Figure 8.Referring to Fig. 5 ~ Fig. 8, first control unit can comprise:
First end of sampling resistor Rs connects the negative output of main circuit 110; Second end of sampling resistor Rs connects first end of the first output switch S o1, is connected second end of the first output switch S o1 with second resistance R 2 through first resistance R 1 of serial connection, also passes through the negative-phase input of first resistance R, 1 connection comparator U1; The normal phase input end of comparator U1 receives predetermined current threshold value Vref; Output connects the control end of the first output switch S o1; Diode D1 through reversal connection connects the on-off state control end of main circuit 110, so that first control unit is controlled the on-off state of main circuit 110 through said on-off state control end.
Shown in Fig. 5 ~ 8; Said main circuit 110 can comprise DC output circuit, Voltage loop and electric current loop etc.; At this moment, first control unit 210 can be realized the control to main circuit switch machine state through the output voltage of electric current loop and/or Voltage loop in the control main circuit.
In said first control unit, output current sampled signal Vr and current threshold Vref are relatively; The first output switch S o1 voltage and first voltage threshold are relatively; The resistance of ignoring sampling resistor Rs, then first voltage threshold is
The operation principle of first control unit shown in Fig. 5 ~ 8 is: sampling resistor Rs detects output current; As the output current sampled signal Vr on the sampling resistor Rs during greater than current threshold Vref; Comparator U1 output low level signal, and control the first output switch S o1 and turn-off diode D1 conducting simultaneously; The electric current loop in the control main circuit and/or the output low level of Voltage loop make the main circuit shutdown.Detect the voltage Vs on the first output switch S o1; As this voltage Vs (value of ignoring sampling resistor Rs) during less than first voltage threshold
; Comparator U1 exports high level; Control the said first output switch S o1 conducting; Diode D1 ends, and does not control the main circuit shutdown, also promptly controls the main circuit start.
In addition; When detect output current sampled signal Vr greater than current threshold Vref after; When the control first output switch S o1 turn-offed, also making the voltage Vr on the sampling resistor Rs was zero, if there is not the voltage Vs of second resistance R 2 and the first output switch S o1 to be input to the inverting input of comparator U1; Then the first output switch S o1 turn-offs; Causing the voltage on the sampling resistor Rs is zero, makes the output of comparator U1 become high level once more again from low level, and promptly the off state of the first output switch S o1 can not be kept a period of time.But in this application; The first output switch S o1 voltage Vs is input to the inverting input of comparator U1 with output current sampled signal Vr, when detect output current sampled signal Vr greater than current threshold Vref after, the control first output switch S o1 turn-offs; Though the voltage Vr on the sampling resistor Rs is zero; But the first output switch S o1 voltage Vs is a high level, makes comparator U1 inverting input keep high level, makes the first output switch S o keep shutoff; Make diode D1 keep conducting; Make main circuit keep off-mode, the charge discharge on output capacitance Co promptly detects the first output switch S o1 voltage Vs and is lower than first voltage threshold to a certain degree.
Fig. 6 suppresses circuit the 5th embodiment of impulse current for the application.Compared to circuit shown in Figure 3, difference only is: a kind of implementation structure of first discharge cell among Fig. 3 has been shown among Fig. 6.As shown in Figure 6, said first discharge cell can be realized through following structure:
The first discharge resistance Rc1 and the first discharge switch Sc1 are serially connected with the two ends of output capacitance Co;
The corresponding respectively two ends that connect Transformer Winding in the main circuit 110 of 610, two inputs of rectifying and wave-filtering subelement are used for the voltage at Transformer Winding two ends is carried out the rectifying and wave-filtering processing, with the rectifying and wave-filtering signal input inversion subelement that obtains;
Wherein, in circuit shown in Figure 6, the negativing ending grounding of Transformer Winding, therefore, an input of rectifying and wave-filtering subelement is ground connection also, and is not shown in the drawings.
In Fig. 6, said first discharge switch can be N type metal-oxide-semiconductor or NPN triode etc.
The operation principle of first discharge cell is among Fig. 6: the corresponding respectively two ends that connect Transformer Winding in the main circuit 110 of two inputs of rectifying and wave-filtering subelement; When main circuit 110 is in off-mode; The voltage at Transformer Winding two ends is zero; The signal of behind rectifying and wave-filtering subelement rectifying and wave-filtering, exporting is zero level or low level; The anti-phase subelement converts this low level or zero level into high level, controls the first discharge switch Sc1 conducting, and output capacitance Co is discharged through the first discharge resistance Rc.Otherwise; When main circuit 110 is in open state; The voltage at Transformer Winding two ends is non-vanishing, behind rectifying and wave-filtering subelement rectifying and wave-filtering, exports high level signal, output low level signal after the anti-phase of anti-phase subelement; Control the first discharge switch Sc1 and turn-off, cut off the discharge loop of output capacitance Co.
The said first discharge switch Sc1 can also realize through P type metal-oxide-semiconductor or PNP triode; At this moment; First discharge cell need not to comprise anti-phase subelement 620; As shown in Figure 7, rectifying and wave-filtering subelement 620 directly exports the rectifying and wave-filtering signal that obtains the control end of the first discharge switch Sc1 to, realizes the control for the first discharge switch Sc1.Its operation principle and Fig. 6 are similar, do not give unnecessary details here.
Fig. 8 is circuit the 7th embodiment that the application suppresses impulse current.Compared to circuit shown in Figure 4, Fig. 8 shows a kind of implementation structure of first discharge cell among Fig. 4.As shown in Figure 8, said first discharge cell can be realized through following structure: the second discharge resistance Rc2 and the second discharge switch Sc2 are serially connected with the two ends of output capacitance Co, and the control end of the second discharge switch Sc2 connects second end of the first output switch S o1.
At this moment, said second voltage threshold can be the conduction threshold of the second discharge switch Sc2.
The operation principle of first discharge cell is described in Fig. 8: when the first output switch S o1 turn-offs; Its voltage Vs is a high level; This high level is during greater than the conduction threshold of the second discharge switch Sc2; Control the second discharge switch Sc2 conducting, make output capacitance Co through second discharge resistance Rc2 discharge; Otherwise when the first output switch S o1 conducting, its voltage Vs is a low level, and this low level is during less than the conduction threshold of the second discharge switch Sc2, and the second discharge switch Sc2 turn-offs, and cuts off the discharge loop of output capacitance Co, stops discharge.
Fig. 9 suppresses circuit the 8th embodiment of impulse current for the application, and said circuit comprises:
The second output switch S o2, first end of the said second output switch S o2 connects the negative output of main circuit 110, and second end of the second output switch S o2 connects the negative-phase input of load 120; Control end connects an output of second control unit 910; This output is used for second control unit and realizes conducting or shutoff control to the second output switch.
Preferably; Second control unit 910 also is used for: detect first end of the second output switch S o2 and the switching voltage between second end; When confirming said switching voltage less than first voltage threshold; The control second output switch S o2 conducting, 110 starts of control main circuit are controlled second discharge cell 920 and are stopped the discharge for output capacitance Co;
Wherein, second control unit 910 can be realized through sending corresponding control signal to these Be Controlled objects when the second output switch S o2, main circuit and second discharge cell 920 are controlled.In addition, second control unit 910 can transmit control signal to these Be Controlled objects simultaneously and control, and also can successively transmit control signal to these Be Controlled objects and control, and does not limit here.
In the circuit shown in Figure 9; Second control unit detects the output current of constant-current source main circuit 110; When confirming said output current greater than the predetermined current threshold value, the control second output switch S o2 turn-offs, main circuit 110 shutdown of control constant-current source; Thereby guarantee that main circuit 110 no longer is under the situation of load 120 power supplies, control discharge cell 920 is the output capacitance discharge; And then second control unit 910 detects the switching voltage between second output switch S o2 first end and second end, when confirming said switching voltage less than first voltage threshold; The control first output switch S o2 conducting; 110 starts of control main circuit are controlled second discharge cell 920 and are stopped to be the output capacitance discharge, like this; After the electric charge on the output capacitance is released; Main circuit 110 is with again to carry and is opened machine, and the voltage on the output capacitance Co begins slow increase from lower set point, impulse current no longer occurs.Thereby; Carry the handoff procedure of state at constant-current source to band from Light Condition; Realized that output capacitance Co goes up charge discharge, eliminated said impulse current, solved constant-current source and switched to the impulse current problem that the voltage instantaneous discharge on the output capacitance causes the process of being with the state of carrying from Light Condition.
Preferably, shown in figure 10, second discharge cell 920 can comprise: the 3rd discharge resistance Rs3 and the 3rd discharge switch Sc3 are serially connected with the two ends of output capacitance Co; The control end of the 3rd discharge switch Sc3 directly connects the output that is used to control output capacitance of second control unit 910; Perhaps; The control end of the 3rd discharge switch Sc3 connects the output of anti-phase subelement 620, and the input of anti-phase subelement 620 connects the output that is used to control output capacitance of second control unit 910.
Preferably, shown in figure 10, said second control unit 910 can comprise:
First end of sampling resistor Rs connects the negative output of main circuit 110; Second end of sampling resistor Rs connects first end of the second output switch S o2, is connected second end of the second output switch S o2 with second resistance R 2 through first resistance R 1 of serial connection, also passes through the negative-phase input of first resistance R, 1 connection comparator U1; The normal phase input end received current threshold value Vref of comparator U1; The output of comparator U1 connects the control end of the second output switch S o2; Diode D1 through reversal connection connects the on-off state control end of main circuit 110, also connects input second discharge cell 920, that be used to receive second control unit, 910 control signals.The implementation structure of second control unit 910 among Figure 10 is with respect to the implementation structure of first control unit 210 in Fig. 5 ~ 8; Difference only is in second control unit 910 among Figure 10 that the output of comparator U1 also connects input second discharge cell 920, that be used to receive second control unit, 910 control signals.
Wherein, the 3rd discharge switch Sc3 described in Figure 10 is N type metal-oxide-semiconductor or NPN triode.At this moment; The operation principle of second discharge cell is mainly: when second control unit 910 detects output current greater than current threshold; The output control signal is controlled the second output switch S o2 and is turn-offed, controls main circuit 110 shutdown, outputs signal to the anti-phase subelement of second discharge cell 920 simultaneously, and the low transition of second control unit 910 being exported through the anti-phase subelement is a high level; And control the 3rd discharge switch Sc3 conducting, make output capacitance Co through the 3rd discharge resistance Rc3 discharge; When second control unit 910 detects the second output switch S o2 voltage Vs and is lower than first voltage threshold; Comparator U1 exports high level; The control second output switch S o2 conducting, diode D1 end, thereby make control main circuit off signal lose efficacy, and also promptly control the main circuit start; Control the 3rd discharge switch Sc3 through the anti-phase subelement in second discharge cell simultaneously and end, cut off the discharge loop of output capacitance.
When the 3rd discharge switch Sc3 was P type metal-oxide-semiconductor or PNP triode, the anti-phase subelement among Figure 10 can omit, and was similar among the operation principle of second discharge cell and Figure 10, do not give unnecessary details here.
Shown in figure 10, the subelement of anti-phase described in the application can be realized through following structure: power voltage terminal Vcc also connects the output of anti-phase subelement through the collector electrode of the 3rd resistance R q connection triode Qc; The base stage of triode Qc connects the input of anti-phase subelement; The grounded emitter of triode Qc.
Shown in Fig. 2 ~ 10, the application suppresses circuit and main circuit 110, output capacitance Co and a kind of power supply circuits of load 120 common formations of impulse current.
In addition; When in the application embodiment, only defining said output current and being not less than the predetermined current threshold value, switching voltage is not more than first voltage threshold, when switching voltage is not less than second voltage threshold, how circuit is handled, for other situation; For example; Greater than first voltage threshold during less than second voltage threshold, where control unit among the application embodiment or discharge cell be like managing less than current threshold or switching voltage for output current, and the application does not limit.
The above only is the application's a preferred implementation; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the application's protection range.
Claims (11)
1. circuit that suppresses impulse current; It is characterized in that; This circuit application is in power supply circuits, and said power supply circuits comprise: output capacitance is serially connected with between two outputs of constant-current source main circuit, and load strings is connected between two outputs of constant-current source main circuit; The circuit of this inhibition impulse current comprises:
The first output switch, first end of the said first output switch connects the negative output of main circuit, and second end of the first output switch connects the negative-phase input of load, and control end connects an output of first control unit;
First control unit is used to detect the output current of constant-current source main circuit, and when confirming said output current greater than the predetermined current threshold value, the control first output switch turn-offs, the main circuit shutdown of control constant-current source;
First discharge cell is serially connected with between the two ends of output capacitance; First discharge cell is used for the parameter preset of testing circuit, when confirming that parameter preset satisfies discharging condition, is the output capacitance discharge, when confirming that parameter preset does not satisfy discharging condition, stops to be the output capacitance discharge; Said discharging condition is used for confirming that constant-current source switches to the process that band carries state from Light Condition, has impulse current in the power supply circuits;
Said first control unit also is used for: detect first end of the first output switch and the switching voltage between second end, and when confirming said switching voltage less than first voltage threshold, the control first output switch conduction, the start of control main circuit.
2. circuit according to claim 1 is characterized in that, said parameter preset is the on-off state of main circuit, and said discharging condition is that main circuit is in off-mode; First discharge cell specifically is used for: detecting the on-off state of main circuit, when the on-off state of confirming main circuit is off-mode, is the output capacitance discharge, and when the on-off state of confirming main circuit was open state, stopping was the output capacitance discharge.
3. circuit according to claim 2 is characterized in that, said first discharge cell comprises:
First discharge resistance and first discharge switch are serially connected with the two ends of output capacitance;
The rectifying and wave-filtering subelement, two corresponding respectively two ends that connect Transformer Winding in the main circuit of input are used for the voltage at Transformer Winding two ends is carried out the rectifying and wave-filtering processing, with the rectifying and wave-filtering signal input inversion subelement that obtains;
The anti-phase subelement is used for that the rectifying and wave-filtering signal is carried out anti-phase and handles, and the inversion signal that obtains is exported to the control end of first discharge switch.
4. circuit according to claim 2 is characterized in that, said first discharge cell comprises:
First discharge resistance and first discharge switch are serially connected with the two ends of output capacitance;
The rectifying and wave-filtering subelement, two corresponding respectively two ends that connect Transformer Winding in the main circuit of input are used for the voltage at Transformer Winding two ends is carried out the rectifying and wave-filtering processing, the rectifying and wave-filtering signal that obtains are exported to the control end of discharge switch.
5. circuit according to claim 1 is characterized in that, said parameter preset is first end of the first output switch and the switching voltage between second end, and said discharging condition is that switching voltage is not less than second voltage threshold; First discharge cell specifically is used for: detect first end of the first output switch and the switching voltage between second end, when confirming that said switching voltage is not less than second voltage threshold, be the output capacitance discharge; When confirming said switching voltage, stop to be the output capacitance discharge less than second voltage threshold.
6. circuit according to claim 5 is characterized in that, said first discharge cell comprises:
Second discharge resistance and second discharge switch are serially connected with the two ends of output capacitance, and the control end of second discharge switch connects second end of the first output switch.
7. according to each described circuit of claim 1 to 6, it is characterized in that said first control unit comprises:
First end of sampling resistor connects the negative output of main circuit; Second end of sampling resistor connects first end of the first output switch, is connected second end of the first output switch with second resistance through first resistance of serial connection, also the negative-phase input through first resistance connection comparator; The normal phase input end received current threshold value of comparator, output connect the control end of the first output switch, connect the on-off state control end of main circuit through the diode of reversal connection.
8. circuit that suppresses impulse current; It is characterized in that; This circuit application is in power supply circuits, and said power supply circuits comprise: output capacitance is serially connected with between two outputs of constant-current source main circuit, and load strings is connected between two outputs of constant-current source main circuit; The circuit of this inhibition impulse current comprises:
The second output switch, first end of the said second output switch connects the negative output of main circuit, and second end connects the negative-phase input of load, and control end connects an output of second control unit;
Second control unit is used to detect the output current of constant-current source main circuit, and when confirming said output current greater than the predetermined current threshold value, the control second output switch turn-offs, the main circuit shutdown of control constant-current source, and controlling second discharge cell is the output capacitance discharge;
Second discharge cell is used under the control of second control unit, being the output capacitance discharge;
Second control unit also is used for: detect first end of the second output switch and the switching voltage between second end; When confirming said switching voltage less than first voltage threshold; The control second output switch conduction, the start of control main circuit is controlled second discharge cell and is stopped to be the output capacitance discharge;
Second discharge cell also is used for: under the control of second control unit, stop to be the output capacitance discharge.
9. circuit according to claim 8 is characterized in that, said second discharge cell comprises:
The 3rd discharge resistance and the 3rd discharge switch are serially connected with the two ends of output capacitance; The control end of the 3rd discharge switch connects an output of second control unit, and perhaps, the control end of the 3rd discharge switch connects the output of anti-phase subelement, and the input of anti-phase subelement connects an output of second control unit.
10. according to Claim 8 or 9 described circuit, it is characterized in that said second control unit comprises:
First end of sampling resistor connects the negative output of main circuit; Second end of sampling resistor connects first end of the second output switch, is connected second end of the second output switch with second resistance through first resistance of serial connection, also the negative-phase input through first resistance connection comparator; The normal phase input end received current threshold value of comparator; The output of comparator connects the control end of the second output switch, connects the on-off state control end of main circuit through the diode of reversal connection, also connects an input of second discharge cell.
11. power supply circuits is characterized in that, comprising: output capacitance is serially connected with between two outputs of constant-current source main circuit, and load strings is connected between two outputs of constant-current source main circuit; Also comprise: the circuit of each described inhibition impulse current of claim 1 to 10.
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| CN201210217139.2A CN102709871B (en) | 2012-06-25 | 2012-06-25 | Impulse current inhibiting circuit and supply circuit |
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| CN201210217139.2A CN102709871B (en) | 2012-06-25 | 2012-06-25 | Impulse current inhibiting circuit and supply circuit |
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| CN106026056A (en) * | 2016-05-18 | 2016-10-12 | 浙江大华技术股份有限公司 | Anti-impact circuit for power supply equipment, power supply equipment, and Ethernet power supply system |
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| CN108152594A (en) * | 2018-01-29 | 2018-06-12 | 中国工程物理研究院电子工程研究所 | A kind of constant-current source tester |
| CN110518563A (en) * | 2019-09-11 | 2019-11-29 | 广东志高暖通设备股份有限公司 | The method and its MCU of overvoltage protection, air-conditioning equipment |
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| CN110996444A (en) * | 2019-12-21 | 2020-04-10 | 杰华特微电子（杭州）有限公司 | Control circuit and control method of lighting circuit |
| CN112671252A (en) * | 2020-12-07 | 2021-04-16 | 珠海格力电器股份有限公司 | Direct-current lighting starting control method, device and system |
| CN112671252B (en) * | 2020-12-07 | 2024-04-09 | 珠海格力电器股份有限公司 | DC illumination start control method, device and system |
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