CN102075098A - Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof - Google Patents
Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof Download PDFInfo
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- CN102075098A CN102075098A CN 200910225603 CN200910225603A CN102075098A CN 102075098 A CN102075098 A CN 102075098A CN 200910225603 CN200910225603 CN 200910225603 CN 200910225603 A CN200910225603 A CN 200910225603A CN 102075098 A CN102075098 A CN 102075098A
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Abstract
The invention discloses a capacitor energy discharging circuit capable of reducing power loss and a power supply circuit thereof. The power supply circuit is connected with an AC (Alternating Current) power supply and a load, wherein the AC power supply outputs an AC voltage, the power supply circuit at least comprises a power supply input end, a filter unit, a main circuit and a capacitor energy discharging circuit, wherein the power supply input end is used for receiving the AC voltage; the filter unit is connected with the power supply input end and is used for filtering the noise of the AC voltage; the main circuit is connected with the filter unit and the load and is used for converting the filtered AC voltage into an output DC (Direct Current) voltage and sending to the load; and the capacitor energy discharging circuit is connected with the power supply input end, the filter unit and a common junction and is used for detecting whether the power supply input end receives the AC voltage or not and releasing electric energy stored in the filter unit when the detection result is negative. The capacitor energy discharging circuit provided by the invention not only accords with the standard formulated by the safety specification, but also can reduce power loss and further develop towards the direction of saving energy, reducing loss and improving the efficiency.
Description
Technical field
The present invention relates to a kind of discharge circuit, especially a kind of capacitive energy discharge circuit and power supply circuit thereof that reduces the loss of power.
Background technology
Utilizing electric capacity to come the power supply circuit of filtering and energy storage is various electronic equipments, indispensable electronic circuit such as computer, server for example, it is in order to receive AC power, civil power for example, and be converted into drive electronics and move needed direct voltage.
See also Fig. 1, it is the structural representation of known power supply circuit.As shown in the figure, known power supply circuit 1 has a main circuit 10, it is connected between an AC power AC and the load 11, become the transition direct voltage in order to the ac voltage rectifier that AC power AC is exported, and this transition direct voltage is converted to the direct voltage of particular level according to load 11 required operating voltages, to drive load 11 actions.
In addition, known power supply circuit 1 also has a filter capacitor C
1, it is connected in the input side of power supply circuit 1 in parallel, and the high-frequency noise of the alternating voltage that is provided in order to filtering AC power AC produces the situation of electromagnetic interference when reducing power supply circuit 1 action.
Moreover, owing to stipulate when power supply circuit 1 breaks away from AC power AC filter capacitor C in the safety standard of electronic equipment
1Institute's electric energy stored needs discharge fast, to reduce the risk that the user gets an electric shock because of contact power supply circuit 1.So for up to specification, as shown in Figure 1, known power supply circuit 1 has more a discharge resistance R
1, with filter capacitor C
1Parallel connection in order to forming a discharge loop, when interrupting receiving the alternating voltage that AC power AC provided when power supply circuit 1, makes filter capacitor C
1On voltage in a time constant (filter capacitor C
1Total capacitance value be multiplied by discharge resistance R
1All-in resistance) through discharge resistance R
1Be discharged to ordered below the mark of safety standard, power supply circuit 1 just can meet the relevant regulations of safety standard whereby.
Though known power supply circuit 1 can meet the ordered standard of safety standard really, however because discharge resistance R
1For be connected in parallel in filter capacitor C always
1Even if, so filter capacitor C
1When receiving alternating voltage, power supply circuit 1 need not discharge, discharge resistance R
1Still can form discharge loop always, thus, when moving when power supply circuit 1 reception alternating voltage, discharge resistance R
1Just can be because of a large amount of electric power in the impedance operator electric consumption supply circuit 1 of itself, make power supply circuit 1 have unnecessary electric energy loss, yet the product of electrical type all develops toward direction energy-conservation and that reduce the wastage at present, so known power supply circuit 1 can't realistic demand.
Therefore, how to develop a kind of capacitive energy discharge circuit and power supply circuit thereof that improves the known technology defective and can reduce the loss of power, real in pressing for the problem of solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of capacitive energy discharge circuit and power supply circuit thereof that reduces the loss of power, when moving in receiving alternating voltage to solve known power supply circuit, can consume electric power because of discharge resistance constitutes discharge loop always, cause known power supply circuit to have the defective of unnecessary electric energy loss.
For reaching above-mentioned purpose, of the present invention one than the broad sense execution mode for a kind of power supply circuit is provided, it is connected with AC power and load, the AC power output AC voltage comprises at least: power input, in order to receive alternating voltage; Filter unit is connected with power input, in order to the noise of filtering alternating voltage; Main circuit is connected with filter unit and load, in order to converting filtered alternating voltage to output dc voltage, and is sent to load; And the capacitive energy discharge circuit, with power input, filter unit and altogether contact is connected, whether receive alternating voltage in order to detect power input, when testing result for not the time, release filter unit institute electric energy stored.
For reaching above-mentioned purpose, of the present invention another than the broad sense execution mode for a kind of power supply circuit is provided, it is connected with AC power and load, the AC power output AC voltage comprises at least: power input, in order to receive alternating voltage; Filter unit is connected with power input, in order to the noise of filtering alternating voltage; Main circuit is connected with filter unit and load, in order to filtered alternating voltage is converted to output dc voltage, and comprises rectification circuit, and rectification circuit is connected with filter unit, in order to filtered ac voltage rectifier is become the transition direct voltage; And the capacitive energy discharge circuit, with power input, rectification circuit and altogether contact is connected, whether receive alternating voltage in order to detect power input, and when testing result when denying, through rectification circuit release filter unit institute electric energy stored.
For reaching above-mentioned purpose, of the present invention another than the broad sense execution mode for a kind of power supply circuit is provided, it is connected with AC power and load, the AC power output AC voltage comprises at least: power input, in order to receive alternating voltage; Filter unit is connected with power input, in order to the noise of filtering alternating voltage; Main circuit, be connected with filter capacitor and load, in order to filtered alternating voltage is converted to output dc voltage, and comprise rectification circuit and energy-storage units, rectification circuit system is connected between filter unit and the energy-storage units, in order to filtered ac voltage rectifier is become the transition direct voltage; And capacitive energy discharge circuit, reaching altogether with power input, filter unit, rectification circuit, energy-storage units, contact is connected, whether receive alternating voltage in order to detect power input, and when testing result for not the time, release filter unit and energy-storage units institute electric energy stored.
Of the present invention another than the broad sense execution mode for a kind of capacitive energy discharge circuit is provided, be applied in the power supply circuit, wherein the power input of power supply circuit is connected with AC power, and has filter unit, capacitive energy discharges circuit and comprises: switching circuit, have the first conduction of current end and the second conduction of current end, second conduction of current end contact together connects: discharge circuit, be connected with the filter capacitor and the first conduction of current end, when being used to the switching circuit conducting, discharge filter unit institute electric energy stored; And discharge loop controller, be connected with the control end of power input and switching circuit, whether receive the alternating voltage that AC power is exported in order to detect power input, when receiving alternating voltage, ends power input conducting when power supply circuit does not receive alternating voltage with the control switch circuit.
In sum, capacitive energy discharge circuit and the power supply circuit thereof that reduces the loss of power of the present invention, can whether receive alternating voltage according to power supply circuit by the capacitive energy discharge circuit, discharge perhaps storage capacitor institute electric energy stored of filtered electrical and form discharge loop dynamically, so power supply circuit of the present invention not only meets the ordered standard of safety standard, and power supply circuit of the present invention can reduce the loss of power, so towards energy-conservation, reduce the wastage and the direction that promotes usefulness develops.
Description of drawings
Fig. 1: it is the structural representation of known power supply circuit.
Fig. 2: it is the circuit block diagram of the power supply circuit of the present invention's first preferred embodiment.
Fig. 3: it is the detailed circuit structural representation of power supply circuit shown in Figure 2.
Fig. 4: it is the detailed circuit structural representation of the power supply circuit of the present invention's second preferred embodiment.
Fig. 5: it is the detailed circuit structural representation of the power supply circuit of the present invention's the 3rd preferred embodiment.
Fig. 6: it is the detailed circuit structural representation of the power supply circuit of the present invention's the 4th preferred embodiment.
Description of reference numerals in the above-mentioned accompanying drawing is as follows:
1,2,5,6: power supply circuit
10,20: main circuit
11: load
2a: power input
21,51,61: the capacitive energy discharge circuit
21a: test side
21b, 61a: first discharge end
21c, 61b: second discharge end
51a: discharge end
61c: the 3rd discharge end
200: rectification circuit
200a: positive output end
201: change-over circuit
210,510: discharge circuit
211: switching circuit
212: the discharge loop controller
213: drive circuit
214,714: the AC power testing circuit
211a: the first conduction of current end
211b: the second conduction of current end
214a: first output
214b: second output
213a: first input end
213b: second input
610: the first discharge circuits
611: the second discharge circuits
C
1, C
2: filter capacitor
C
3: the first dividing potential drop electric capacity
C
4: the second dividing potential drop electric capacity
C
5: the 3rd dividing potential drop electric capacity
C
6: pulsed capacitance
C
7: storage capacitor
D
1～D
2: the first～the second discharge diode
D
3: first rectifier diode
D
4: second rectifier diode
D
5: the pressure reduction diode
AC: AC power
V
Ac: alternating voltage
V
Im: the transition direct voltage
V
n: first detection signal
V
p: second detection signal
V
o: output dc voltage
V
Aux: accessory power supply
R
1, R
2, R
9: discharge resistance
R
2': first discharge resistance
R
9': second discharge resistance
R
3: first voltage regulation resistance
R
4: second voltage regulation resistance
R
5: first current-limiting resistance
R
6: second current-limiting resistance
R
7: the 3rd voltage regulation resistance
R
8: the 4th voltage regulation resistance
B
1: the NPN bipolar junction transistor
B
2: the PNP bipolar junction transistor
COM: be total to contact
P: control end
Embodiment
Some exemplary embodiments that embody feature of the present invention and advantage will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations on different modes, it does not depart from the scope of the present invention, and explanation wherein and the accompanying drawing usefulness that ought explain in itself, but not in order to restriction the present invention.
See also Fig. 2, it is the circuit block diagram of the power supply circuit of the present invention's first preferred embodiment.As shown in the figure, the power supply circuit 2 of present embodiment is electrically connected with an AC power AC and a load 11, and wherein AC power AC exports an alternating voltage V
Ac, power supply circuit 2 is mainly used to alternating voltage V
AcCarry out rectification and convert an output dc voltage V to
o, to provide load 11 actions required power supply.Power supply circuit 2 mainly comprises a power input 2a, a filter unit, a main circuit 20 and a capacitive energy discharge circuit 21.
In the present embodiment, filter unit can be but is not limited to a filter capacitor C
2, it is connected with AC power AC, in order to receive and filtering alternating voltage V
AcHigh-frequency noise, the electromagnetic interference that is produced when reducing power supply circuit 2 actions.20 of main circuits are arranged at filter capacitor C
2And between the load 11, in order to will be through filter capacitor C
2Filtered alternating voltage V
AcRectification, and convert output dc voltage V to
o, to offer load 11.
In the present embodiment, capacitive energy discharge circuit 21 can comprise a test side 21a, the first discharge end 21b and the second discharge end 21c, wherein test side 21a can be connected with the power input 2a of power supply circuit 2, and the first discharge end 21b and the second discharge end 21c then are connected to filter capacitor C
2Positive input terminal and negative input end, in addition, capacitive energy discharge circuit 21 contact COM more together connects, whether capacitive energy discharge circuit 21 mainly receives alternating voltage V by the power input 2a that test side 21a detects power supply circuit 2
Ac, and when the result who detects for not the time, then in filter capacitor C
2And form altogether a discharge loop between the contact COM, with filter capacitor C
2Inner institute electric energy stored is discharged to this discharge loop through the first discharge end 21b and the second discharge end 21c.
As from the foregoing, because the capacitive energy discharge circuit 21 of present embodiment does not only receive alternating voltage V at the power input 2a that detects power supply circuit 2
AcThe time, just can form discharge loop, with filter capacitor C
2Inner institute electric energy stored is through the discharge loop repid discharge, to meet the ordered standard of safety standard.Otherwise, when power supply circuit 2 receives alternating voltage V
AcAnd during regular event, filter capacitor C
2Inside will charge normal, and capacitive energy discharge circuit 21 can't constitute discharge loop at this moment, thus, with the power supply that can not electric consumption supply circuit 2 be received by AC power AC, so power supply circuit 2 of the present invention can reduce electric energy loss by the patterns that capacitive energy discharge circuit 21 dynamically forms discharge loops, so towards energy-conservation, reduce the wastage and the direction that promotes usefulness develops.
See also Fig. 3 and cooperate Fig. 2, wherein Fig. 3 is the detailed circuit structural representation of power supply circuit shown in Figure 2.As shown in the figure, main circuit 20 comprises a rectification circuit 200 and a change-over circuit 201.Wherein, rectification circuit 200 can be but is not limited to and is made of bridge rectifier, rectification circuit 200 and filter capacitor C
2Connect in parallel, in order to will be through filter capacitor C
2Filtered alternating voltage V
AcBe rectified into a transition direct voltage V
Im, change-over circuit 201 then is connected between rectification circuit 200 and the load 11, is mainly used to receive transition direct voltage V
Im, and according to load 11 required operating voltages with transition direct voltage V
ImBe converted to output dc voltage V
o, to drive load 11 actions.
21 of capacitive energy discharge circuits comprise a discharge circuit 210, switching circuit 211 and discharge loop controller 212.Wherein switching circuit 211 can be but is not limited to by a junction field effect transistor (Junction Field Effect Transistor, JFET) constitute, and better person can be comparatively cheap by cost, and circuit is realized a more or less freely mos field effect transistor (Metal Oxide Semiconductor Field Effect Transistor, MOSFET) constitute, in addition, switching circuit 211 more can be but is not limited to select for use the transistor of N type, and can be serially connected with between discharge circuit 210 and the common contact COM, so the first conduction of current end 211a of switching circuit 211 and the second conduction of current end 211b can be connected with discharge circuit 210 and common contact COM respectively.
Wherein, discharge circuit 210 comprises the first discharge end 21b and the second discharge end 21c, respectively with filter capacitor C
2Two ends connect, promptly respectively with filter capacitor C
2Positive input terminal and negative input end connect, discharge circuit 210 is in order to when switching circuit 211 conductings, release filter capacitor C
2Institute's electric energy stored.In the present embodiment, discharge circuit 210 can be but is not limited to comprise one first discharge diode D
1, the second discharge diode D
2And discharge resistance R
2, the first discharge diode D wherein
1Anode tap system through the first discharge end 21b and with filter capacitor C
2Positive input terminal connect the second discharge diode D
2Anode tap then be connected in filter capacitor C via the second discharge end 21c
2Negative input end, the first discharge diode D
1The cathode terminal and the second discharge diode D
2Cathode terminal then with discharge resistance R
2An end connect and discharge resistance R
2The other end then be connected with the first conduction of current end 211a of switching circuit 211, wherein, the first discharge diode D
1And the second discharge diode D
2In order to rectification, discharge resistance R
2Then in order to when switching circuit 211 conductings, the impedance operator of utilization itself and consume filter capacitor C
2Institute's electric energy stored.
In the present embodiment, AC power testing circuit 214 can be by one first dividing potential drop capacitor C
3, one second dividing potential drop capacitor C
4, one the 3rd dividing potential drop capacitor C
5, the first rectifier diode D
3And the second rectifier diode D
4Form.Wherein, the first dividing potential drop capacitor C
3An end be connected with test side 21a, and be connected with the power input 2a of power supply circuit 2, and the first dividing potential drop capacitor C via test side 21a
3The other end and the first rectifier diode D
3The cathode terminal and the second rectifier diode D
4Anode tap connect the first rectifier diode D
3The anode tap and the second dividing potential drop capacitor C
4And first output 214a connect and the second rectifier diode D
4Cathode terminal then with the 3rd dividing potential drop capacitor C
5And second output 214b connect, as for the second dividing potential drop capacitor C
4And the 3rd dividing potential drop capacitor C
5Then contact COM connects more together.
When the power input 2a of power supply circuit 2 receives alternating voltage V
Ac, and in positive half cycle during cycle period, alternating voltage V
AcCan be through the first dividing potential drop capacitor C
3And the second rectifier diode D
4And to the 3rd dividing potential drop capacitor C
5Charging makes the 3rd dividing potential drop capacitor C
5Be produced as on the occasion of the second detection signal V
p, and in negative half period cycle period, alternating voltage V
AcThen can be via the first dividing potential drop capacitor C
3And the first rectifier diode D
3And to the second dividing potential drop capacitor C
4Charging makes the second dividing potential drop capacitor C
4Be produced as the first detection signal V of negative value
n
In other embodiments, AC power testing circuit 214 more can be but is not limited to comprise one first voltage regulation resistance R
3And one second voltage regulation resistance R
4, the first voltage regulation resistance R wherein
3With the second dividing potential drop capacitor C
4Be connected in parallel, in order to stablize the second dividing potential drop capacitor C
4On the first detection signal V
nVoltage level, and the second voltage regulation resistance R
4With the 3rd dividing potential drop capacitor C
5Be connected in parallel, in order to stablize the 3rd dividing potential drop capacitor C
5On the second detection signal V
pVoltage level.
Please consult Fig. 3 again, drive circuit 213 except by first input end 213a and the second input 213b respectively with the first output 214a of AC power testing circuit 214 and the second output 214b are connected, more be connected with the control end P and the common contact COM of switching circuit 211, drive circuit 213 is in order to the foundation first detection signal V
nAnd the action of control switch circuit 211, whereby, as the drive circuit 213 foundations first detection signal V
nVoltage level be stabilized in a negative value and learn that the power input 2a of power supply circuit 2 receives alternating voltage V
AcThe time, drive circuit 213 just can end by control switch circuit 211, otherwise, as the drive circuit 213 foundations first detection signal V
nVoltage level begin to promote and learn that the power input 2a of power supply supply electricity 2 does not receive alternating voltage V towards zero by negative value
AcThe time, drive circuit 213 just can be with the second detection signal V of AC power testing circuit 214 outputs
pBe sent to the control end P of switching circuit 211, open open circuit 211 conductings with control.
In the present embodiment, drive circuit 213 mainly comprises a pulsed capacitance C
6, a pressure reduction diode D
5, a NPN bipolar junction transistor B
1, a PNP bipolar junction transistor B
2, one first current-limiting resistance R
5And one second current-limiting resistance R
6Pulsed capacitance C
6Be connected with the first output 214a of AC power testing circuit 214 and receive the first detection signal V
n, and with the first current-limiting resistance R
5And pressure reduction diode D
5Cathode terminal connect pulsed capacitance C
6The power input 2a that is used to power supply circuit 2 does not receive alternating voltage V
AcThe time, with the first detection signal V
nBe converted to a positive pulse signal.
Pressure reduction diode D
5Anode tap and NPN bipolar junction transistor B
1Emitter and altogether contact COM connect.The first current-limiting resistance R
5With NPN bipolar junction transistor B
1Base stage connect the first current-limiting resistance R
5Flow into NPN bipolar junction transistor B in order to restriction
1The magnitude of current of base stage.NPN bipolar junction transistor B
1Emitter together contact COM connect, collector electrode then with the second current-limiting resistance R
6Connect.The second current-limiting resistance R
6More with PNP bipolar junction transistor B
2Base stage connect, be mainly used to restriction and flow into PNP bipolar junction transistor B
2The magnitude of current of base stage.PNP bipolar junction transistor B
2Emitter be connected with the second input 213b, and be connected with the second output 214b of AC power testing circuit 214, to receive the second detection signal V via the second input 213b
p, collector electrode then is connected with the control end P of switching circuit 211.
In certain embodiments, drive circuit 213 more can be but is not limited to comprise one the 3rd voltage regulation resistance R
7And the 4th voltage regulation resistance R
8, the 3rd voltage regulation resistance R wherein
7Two ends respectively with PNP bipolar junction transistor B
2Emitter and base stage connect, be mainly used to stablize PNP bipolar junction transistor B
2Operate condition.And the 4th voltage regulation resistance R
8Two ends then respectively with PNP bipolar junction transistor B
2The collector electrode and the control end P of switching circuit 211 connect, be mainly used to the operate condition of stable switch circuit 211.
Below the manner of execution of capacitive energy discharge circuit 21 of power supply circuit 2 that rough explanation is shown in Figure 3.Please consult Fig. 2 and Fig. 3 again.As shown in Figure 2 to Figure 3, the power input 2a when power supply circuit 2 receives alternating voltage V
AcThe time, filter capacitor C
2Just can be because of alternating voltage V
AcCharging and begin storage of electrical energy, and main circuit 20 will provide an output dc voltage V
oTo load 11, in addition, in alternating voltage V
AcPositive half period cycle period, alternating voltage V
AcThe direct impulse electric current that provides will be via the first dividing potential drop capacitor C
3, the second rectifier diode D
4And to the 3rd dividing potential drop capacitor C
5Charging makes the 3rd dividing potential drop capacitor C
5Be produced as on the occasion of the second detection signal V
p, and in alternating voltage V
AcNegative half-cycle cycle period, alternating voltage V
AcThe negative-going pulse electric current that provides will be through the first dividing potential drop capacitor C
3, the first rectifier diode D
3And to the second dividing potential drop capacitor C
4Charging makes the second dividing potential drop capacitor C
4Be produced as the first detection signal V of negative value
n
At this moment, voltage level is stable at the first detection signal V of a negative value
nCan be through the pulse capacitor C
6And the first current-limiting resistance R
5And order about NPN bipolar junction transistor B
1End, simultaneously, because NPN bipolar junction transistor B
1End, so PNP bipolar junction transistor B
2Emitter and the voltage between base stage just can be less than PNP bipolar junction transistor B
2Conducting voltage, so PNP bipolar junction transistor B
2Just and then end, thus, switching circuit 211 just can't conducting and present cut-off state, and the discharge resistance R2 in the guiding discharge circuit 210 can't constitute the loop and form and open circuit, so receive alternating voltage V in power supply circuit 2
AcAnd when action, a large amount of electric power of capacitive energy discharge circuit 21 in just can electric consumption supply circuit 2, and then make power supply circuit 2 compared to known power supply circuit, have the advantage that can reduce electric energy loss.
Otherwise, when the power input 2a of power supply circuit 2 does not receive alternating voltage V
AcThe time, the second dividing potential drop capacitor C
4And the 3rd dividing potential drop capacitor C
5Just begin to discharge institute's electric energy stored, make the detection signal V that wins
nVoltage level begin towards zero to promote and the second detection signal V by negative value
pVoltage then by on the occasion of the beginning fall towards subzero, at this moment, because of the first detection signal V
nVoltage level have a variable quantity, will cause pulsed capacitance C
6Produce a positive pulse signal accordingly, and through the first current-limiting resistance R
5Be sent to NPN bipolar junction transistor B
1Base stage, order about NPN bipolar junction transistor B
1The beginning conducting, simultaneously, because NPN bipolar junction transistor B
1Conducting, PNP bipolar junction transistor B
2Emitter and the voltage between base stage just can be greater than PNP bipolar junction transistor B
2Conducting voltage, make PNP bipolar junction transistor B
2And then conducting is so the 3rd dividing potential drop capacitor C
5On the second detection signal V
pJust can be through PNP bipolar junction transistor B
2Be sent to the control end P of switching circuit 211, to order about switching circuit 211 conductings, so the discharge resistance R in the discharge circuit 210
2And just form a discharge loop between the switching circuit 211, so filter capacitor C
2Institute's electric energy stored just can be via this discharge loop repid discharge, so power supply circuit 2 just can meet the ordered standard of safety standard.
See also Fig. 4, it is the detailed circuit structural representation of the power supply circuit of the present invention's second preferred embodiment.As shown in Figure 4, the circuit structure of the circuit structure of the power supply circuit 5 of present embodiment and power supply circuit 2 shown in Figure 3 is similar, and the element representative structure and the functional similarity of same-sign, so following will repeat no more the element characteristics of power supply circuit 5 and the manner of execution of internal circuit.Compared to capacitive energy discharge circuit 21 shown in Figure 3, the discharge circuit 510 of the capacitive energy discharge circuit 51 of present embodiment only has a discharge end 51a, and discharge end 51a is connected with the positive output end 200a of rectification circuit 200, in addition, discharge circuit 510 also is connected with the first conduction of current end 211a of switching circuit 211.Therefore work as power supply circuit 5 and do not receive alternating voltage V
AcThe time, filter capacitor C
2Inner institute electric energy stored just can be sent to rectification circuit 200 earlier and is rectified into direct voltage, is sent to capacitive energy discharge circuit 51 formed discharge loops again via discharge end 51a and discharges.
Because the filter capacitor C of the power supply circuit 5 of present embodiment
2Institute's electric energy stored is when discharging, the discharge circuit 510 of present embodiment can be sent to rectification circuit 200 earlier, and form direct current energy, so only need have a discharge end 51a by the rectification of rectification circuit 200, and need not as shown in Figure 3 discharge circuit 210, because of filter capacitor C
1Institute's electric energy stored is when discharging, and the not rectification of process rectification circuit 200 earlier is so discharge circuit 210 need have the first discharge end 21b and the second discharge end 21c receives AC energy.And the discharge circuit 210 that the discharge circuit 510 of the capacitive energy discharge circuit 51 of present embodiment also need not as shown in Figure 3 must be by the first discharge diode D
1And the second discharge diode D
2Carry out rectification, and can only have discharge resistance R
9
Please consult Fig. 4 again, in the present embodiment, main circuit 20 more can have an energy-storage units, for example a storage capacitor C
7, itself and rectification circuit 200 are connected in parallel, and storage capacitor C
7Positive input terminal be connected with the discharge end 51a of capacitive energy discharge circuit 51, can be used to the transition direct voltage V that rectification circuit 200 is exported
ImCarry out voltage stabilizing.
Because storage capacitor C
7Be connected with the discharge end 51a of capacitive energy discharge circuit 51, the power input 2a that therefore works as the power supply circuit 5 of present embodiment does not receive alternating voltage V
AcThe time, capacitive energy discharge circuit 51 formed discharge loops not only can discharge filter capacitor C
2Institute's electric energy stored, discharge energy-storage capacitor C more simultaneously
7Institute's electric energy stored.
See also Fig. 5, it is the detailed circuit structural representation of the power supply circuit of the present invention's the 3rd preferred embodiment.As shown in Figure 5, the partial circuit structure system of the power supply circuit 6 of present embodiment is similar with the circuit structure of power supply circuit 5 shown in Figure 4, and the element representative structure and the functional similarity of same-sign, so the following manner of execution that will repeat no more power supply circuit 6 internal circuits.Compared to capacitive energy discharge circuit 51 shown in Figure 4, the capacitive energy discharge circuit 61 of present embodiment has first discharge circuit 610 and second discharge circuit 611, wherein first discharge circuit 610 has the first discharge end 61a and the second discharge end 61b, and can be by the first discharge diode D1, the second discharge diode D2 and the first discharge resistance R
2' form, wherein the first discharge end 61a and the second discharge end 61b respectively with filter capacitor C
2Positive input terminal and negative input end connect, first discharge circuit 610 forms a discharge loop with switching circuit 211, with release filter capacitor C in order to when switching circuit 211 conductings
2Institute's electric energy stored.And first discharge circuit 610 and discharge circuit 210 structural similarities shown in Figure 3, so no longer be repeated in this description in this.
Therefore the power supply circuit 6 when present embodiment does not receive alternating voltage V
AcThe time, first discharge circuit 610 in the capacitive energy discharge circuit 61 and the switching circuit 211 formed discharge loops first filter capacitor C that can discharge
2Institute's electric energy stored, second discharge circuit 611 and switching circuit 211 formed another discharge loops are the discharge energy-storage capacitor C then
7Institute's electric energy stored is so by first discharge circuit 610 and second discharge circuit 611, just can make filter capacitor C
2And storage capacitor C
7Discharge by discharge loop independently separately and reach the effect of accelerating discharge time.
See also Fig. 6, it is the detailed circuit structural representation of the power supply circuit of the present invention's the 4th preferred embodiment.As shown in Figure 6, the circuit structure of the partial circuit structure of the power supply circuit 7 of present embodiment and power supply circuit 2 shown in Figure 3 is similar, and the element representative structure and the functional similarity of same-sign, so the following manner of execution that will repeat no more power supply circuit 7 internal circuits.Compared to drive circuit shown in Figure 2 213, the second input 213b of the drive circuit 213 of present embodiment change by with an accessory power supply V
AuxBe connected, so the PNP bipolar junction transistor B of drive circuit 213
2Emitter also accordingly via the second input 213b with accessory power supply V
AuxConnect, in addition, this accessory power supply V
AuxCan be but be not limited to by power supply circuit 7 in receiving alternating voltage V
AcThe time, with alternating voltage V
AcPart energy store and produce, it can provide a constant positive voltage to use to the electronic building brick of power supply circuit 7 inside.
Therefore the power input 2a when power supply circuit 2 does not receive alternating voltage V
Ac, and the first detection signal V
nOrder about NPN bipolar junction transistor B
1And PNP bipolar junction transistor B
2During the beginning conducting, accessory power supply V
AuxJust can be through PNP bipolar junction transistor B
2Be sent to the control end P of switching circuit 211, to order about switching circuit 211 conductings, thus, the discharge resistance R in the discharge circuit 210
2And can form a discharge loop between the switching circuit 211, so filter capacitor C
2Institute's electric energy stored just can make power supply circuit 2 can meet the ordered standard of safety standard via this discharge loop repid discharge.
Because the switching circuit 211 of present embodiment changes by accessory power supply V
AuxThe conducting that drives, so testing circuit 714 testing circuits 214 interior and that need not as shown in Figure 2 of present embodiment need have the 3rd dividing potential drop capacitor C
5Produce the second detection signal V
PAnd need have the second voltage regulation resistance R
4Stablize the 3rd dividing potential drop capacitor C
5On the second detection signal V
pVoltage level, also need not to have the second output 214b, be connected in the first dividing potential drop capacitor C and can only have
3And the second rectifier diode D between the common contact COM
4
In sum, the invention provides a kind of capacitive energy discharge circuit and power supply circuit thereof that reduces the loss of power, can whether receive alternating voltage according to power supply circuit by the capacitive energy discharge circuit, discharge perhaps storage capacitor institute electric energy stored of filtered electrical and form discharge loop dynamically, so power supply circuit of the present invention not only meets the ordered standard of safety standard, and power supply circuit of the present invention can reduce the loss of power, so towards energy-conservation, reduce the wastage and the direction that promotes usefulness develops.
The present invention must be appointed by those of ordinary skills and executes that the craftsman thinks and be to modify as all, does not take off the scope as the desire protection of attached claim institute.
Claims (30)
1. power supply circuit, it is connected with an AC power and a load, and this AC power is exported an alternating voltage, comprises at least:
One power input is in order to receive this alternating voltage;
One filter unit is connected with this power input, in order to the noise of this alternating voltage of filtering;
One main circuit is connected with this filter unit and this load, in order to converting filtered this alternating voltage to an output dc voltage, and is sent to this load; And
One capacitive energy discharge circuit, with this power input, this filter unit and altogether contact is connected, whether receive this alternating voltage in order to detect this power input, when testing result when denying, discharge this filter unit institute electric energy stored.
2. power supply circuit as claimed in claim 1, wherein this capacitive energy discharge circuit comprises:
One switching circuit has one first conduction of current end and one second conduction of current end, and contact is connected this second conduction of current end with being somebody's turn to do altogether:
One discharge circuit is connected with this filter unit and this first conduction of current end, when being used to this switching circuit conducting, discharges this filter unit institute electric energy stored; And
One discharge loop controller, be connected with a control end of this power input and this switching circuit, whether receive this alternating voltage in order to detect this power input, when receiving this alternating voltage, ends this power input conducting when this power supply circuit does not receive this alternating voltage to control this switching circuit.
3. power supply circuit as claimed in claim 2, wherein this switching circuit is a junction field effect transistor or a mos field effect transistor.
4. power supply circuit as claimed in claim 2, wherein this discharge circuit comprises:
One first discharge diode, it is connected with the positive input terminal of this filter unit;
One second discharge diode, it is connected with the negative input end of this filter unit; And
One discharge resistance, it is connected with this first conduction of current end of this first discharge diode, this second discharge diode and this switching circuit.
5. power supply circuit as claimed in claim 2, wherein this discharge loop controller comprises:
One AC power testing circuit is connected with this power input, and it detects this power input and whether receives this alternating voltage, and exports one first detection signal according to testing result.
6. power supply circuit as claimed in claim 5, wherein, when this power input received this alternating voltage, this first detection signal was a negative value, and when this power input did not receive this alternating voltage, this first detection signal was promoted towards zero by this negative value.
7. power supply circuit as claimed in claim 5, wherein this discharge loop controller also comprises:
One drive circuit is connected with this control end, this AC power testing circuit and this common contact of this switching circuit, and it receives this first detection signal and one second detection signal, and controls the action of this switching circuit according to this first detection signal;
Wherein, when this drive circuit learns that by this first detection signal judgement this power input receives this alternating voltage, this drive circuit is controlled this switching circuit and is ended, when this drive circuit learns that by this first detection signal judgement this power input does not receive this alternating voltage, this drive circuit is sent to this control end of this switching circuit with this second detection signal, opens the open circuit conducting to control this.
8. power supply circuit as claimed in claim 7, wherein this AC power testing circuit comprises:
One first dividing potential drop electric capacity is connected with this power input;
One first rectifier diode is connected with this first dividing potential drop electric capacity; And
One second dividing potential drop electric capacity is connected with this first rectifier diode;
Wherein, when this power input receives this alternating voltage, and in negative half period cycle period, this alternating voltage to this second dividing potential drop electric capacity charging, makes this second dividing potential drop electric capacity produce this first detection signal through this first dividing potential drop electric capacity and this first rectifier diode.
9. power supply circuit as claimed in claim 8, wherein this AC power testing circuit also comprises:
One second rectifier diode is connected with this first dividing potential drop electric capacity; And
One the 3rd dividing potential drop electric capacity is connected with this second rectifier diode;
Wherein, when this power input receives this alternating voltage, and in positive half cycle cycle period, this alternating voltage charges to the 3rd dividing potential drop electric capacity through this first dividing potential drop electric capacity and this second rectifier diode, makes the 3rd dividing potential drop electric capacity produce this second detection signal.
10. power supply circuit as claimed in claim 9, wherein this AC power testing circuit also comprises:
One first voltage regulation resistance, it is connected with this second dividing potential drop electric capacity, in order to stablize the voltage level of this first detection signal; And
One second voltage regulation resistance, it is connected with the 3rd dividing potential drop electric capacity, in order to stablize the voltage level of this second detection signal.
11. power supply circuit as claimed in claim 9, wherein this drive circuit comprises:
One pulsed capacitance is connected with this second dividing potential drop electric capacity and receives this first detection signal;
One pressure reduction diode, its two ends reach altogether with this pulsed capacitance respectively, and contact is connected;
One first current-limiting resistance is connected with this pulsed capacitance;
One NPN bipolar junction transistor, its base stage and emitter are connected to this first current-limiting resistance and should be total to contact;
One second current-limiting resistance is connected with the collector electrode of this NPN bipolar junction transistor; And
One PNP bipolar junction transistor, its base stage, emitter and collector electrode are connected with this control end of this second current-limiting resistance, the 3rd dividing potential drop electric capacity and this switching circuit respectively;
Wherein, when this power input receives this alternating voltage, this first detection signal is through this pulsed capacitance and this first current-limiting resistance drives this NPN bipolar junction transistor and this PNP bipolar junction transistor ends, end to order about this switching circuit, and when this power input does not receive this alternating voltage, it is a positive pulse signal that this pulsed capacitance is changed this first detection signal, to drive this NPN bipolar junction transistor and this PNP bipolar junction transistor conducting, so that this second detection signal drives this switching circuit conducting through this PNP bipolar junction transistor.
12. power supply circuit as claimed in claim 11, wherein this drive circuit also comprises:
One the 3rd voltage regulation resistance is connected between the base stage and emitter of this PNP bipolar junction transistor, in order to stablize the operate condition of this PNP bipolar junction transistor.
13. power supply circuit as claimed in claim 11, wherein this drive circuit also comprises:
One the 4th voltage regulation resistance is connected between this control end of the collector electrode of this PNP bipolar junction transistor and this switching circuit, in order to stablize the operate condition of this switching circuit.
14. power supply circuit as claimed in claim 7, wherein this second detection signal is exported by this AC power testing circuit, and when this power input receives this alternating voltage, this second detection signal be on the occasion of, and when this power input does not receive this alternating voltage, this second detection signal by this on the occasion of falling towards subzero.
15. power supply circuit as claimed in claim 5, wherein this discharge loop controller also comprises:
One drive circuit is connected with this control end, this AC power testing circuit and this common contact of this switching circuit, and it receives this first detection signal and an accessory power supply, and controls the action of this switching circuit according to this first detection signal;
Wherein, when this drive circuit learns that by this first detection signal judgement this power input receives this alternating voltage, this drive circuit is controlled this switching circuit and is ended, when this drive circuit learns that by this first detection signal judgement this power input does not receive this alternating voltage, this drive circuit is sent to this control end of this switching circuit with this accessory power supply, opens the open circuit conducting to control this.
16. power supply circuit as claimed in claim 15, wherein this accessory power supply provides a positive voltage.
17. power supply circuit as claimed in claim 2, wherein this main circuit comprises:
One rectification circuit is connected with this filter unit, in order to this ac voltage rectifier after this filtering unit filters is become a transition direct voltage.
18. power supply circuit as claimed in claim 17, wherein this main circuit also comprises:
One change-over circuit is connected between this rectification circuit and this load, in order to receiving this transition direct voltage, and according to the required operating voltage of this load this transition direct voltage is converted to this output dc voltage.
19. power supply circuit as claimed in claim 17, wherein this rectification circuit is a bridge rectifier.
20. power supply circuit as claimed in claim 1, wherein this filter unit is an electric capacity.
21. a power supply circuit, it is connected with an AC power and a load, and this AC power is exported an alternating voltage, comprises at least:
One power input is in order to receive this alternating voltage;
One filter unit is connected with this power input, in order to the noise of this alternating voltage of filtering;
One main circuit, be connected with this filter unit and this load, in order to filtered this alternating voltage is converted to an output dc voltage, and comprise a rectification circuit, this rectification circuit is connected with this filter unit, in order to filtered this ac voltage rectifier is become a transition direct voltage; And
One capacitive energy discharge circuit, reaching altogether with this power input, this rectification circuit, contact is connected, whether receive this alternating voltage in order to detect this power input, and when testing result for not the time, through this rectification circuit this filter unit institute electric energy stored of discharging.
22. power supply circuit as claimed in claim 21, wherein this capacitive energy discharge circuit comprises:
One switching circuit has one first conduction of current end and one second conduction of current end, and contact is connected this second conduction of current end with being somebody's turn to do altogether:
One discharge circuit is connected with this rectification circuit and this first conduction of current end, when being used to this switching circuit conducting, and this filter unit institute electric energy stored of discharging;
One discharge loop controller, be connected with a control end of this power input and this switching circuit, whether receive this alternating voltage in order to detect this power supply circuit, when receiving this alternating voltage, ends this power input conducting when this power input stops to receive this alternating voltage to control this switching circuit.
23. power supply circuit as claimed in claim 22, wherein this discharge circuit comprises a discharge resistance, and this discharge resistance is connected with this first conduction of current end of this rectification circuit and this switching circuit.
24. power supply circuit as claimed in claim 21, wherein this main circuit has more an energy-storage units, it is connected between this rectification circuit and this load, and be connected with this capacitive energy discharge circuit, in order to this transition direct voltage is carried out voltage stabilizing, and when this power input stops to receive this alternating voltage, by this institute of capacitive energy discharge circuit discharge electric energy stored own.
25. power supply circuit as claimed in claim 24, wherein this energy-storage units is an electric capacity.
26. power supply circuit as claimed in claim 21, wherein this filter unit is an electric capacity.
27. a power supply circuit, it is connected with an AC power and a load, and this AC power is exported an alternating voltage, comprises at least:
One power input is in order to receive this alternating voltage;
One filter unit is connected with this power input, in order to the noise of this alternating voltage of filtering;
One main circuit, be connected with this filter unit and this load, in order to filtered this alternating voltage is converted to an output dc voltage, and comprise a rectification circuit and an energy-storage units, this rectification circuit is connected between this filter unit and this energy-storage units, in order to filtered this ac voltage rectifier is become a transition direct voltage; And
One capacitive energy discharge circuit, reaching altogether with this power input, this filter unit, this rectification circuit, this energy-storage units, contact is connected, whether receive this alternating voltage in order to detect this power input, and when testing result for not the time, discharge this filter unit and this energy-storage units institute electric energy stored.
28. power supply circuit as claimed in claim 27, wherein this capacitive energy discharge circuit comprises:
One switching circuit has one first conduction of current end and one second conduction of current end, and contact is connected this second conduction of current end with being somebody's turn to do altogether;
One first discharge circuit is connected with two ends and this first conduction of current end of this filter unit, when being used to this switching circuit conducting, and this filter unit institute electric energy stored of discharging;
One second discharge circuit is connected with a positive input terminal and this first conduction of current end of this rectification circuit, this energy-storage units, when being used to this switching circuit conducting, and this energy-storage units institute electric energy stored of discharging; And
One discharge loop controller, be connected with a control end of this power input and this switching circuit, whether receive this alternating voltage in order to detect this power supply circuit, when receiving this alternating voltage, ends this power input conducting when this power input stops to receive this alternating voltage to control this switching circuit.
29. power supply circuit as claimed in claim 27, wherein this filter unit and energy-storage units all are electric capacity.
30. a capacitive energy discharge circuit is applied in the power supply circuit, wherein a power input of this power supply circuit is connected with an AC power, and has a filter unit, and this capacitive energy discharge circuit comprises:
One switching circuit has one first conduction of current end and one second conduction of current end, and this second conduction of current end is connected with contact altogether;
One discharge circuit is connected with this filter unit and this first conduction of current end, when being used to this switching circuit conducting, and this filter unit institute electric energy stored of discharging; And
One discharge loop controller, be connected with a control end of this power input and this switching circuit, whether receive the alternating voltage that this AC power is exported in order to detect this power input, when receiving this alternating voltage, ends this power input conducting when this power supply circuit does not receive this alternating voltage to control this switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910225603 CN102075098B (en) | 2009-11-25 | 2009-11-25 | Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910225603 CN102075098B (en) | 2009-11-25 | 2009-11-25 | Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof |
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| CN102075098A true CN102075098A (en) | 2011-05-25 |
| CN102075098B CN102075098B (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910225603 Expired - Fee Related CN102075098B (en) | 2009-11-25 | 2009-11-25 | Capacitor energy discharging circuit capable of reducing power loss and power supply circuit thereof |
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| CN102332835A (en) * | 2010-07-12 | 2012-01-25 | 台达电子工业股份有限公司 | Discharge circuit of power supply circuit and active control circuit of discharge circuit |
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| CN103872887A (en) * | 2012-12-17 | 2014-06-18 | 尼克森微电子股份有限公司 | Low-power-consumption leakage circuit and AC (Alternating Current) conversion system with same |
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