CN102075098A - Capacitive energy discharge circuit capable of reducing power loss and its power supply circuit - Google Patents

Capacitive energy discharge circuit capable of reducing power loss and its power supply circuit Download PDF

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Publication number
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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circuit
power supply
voltage
discharge
input terminal
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CN 200910225603
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CN102075098B (en
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罗正益
林振德
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Delta Electronics Inc
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Delta Electronics Inc
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Abstract

The invention discloses a capacitance energy discharge circuit capable of reducing power loss and a power supply circuit thereof, wherein the power supply circuit is connected with an alternating current power supply and a load, the alternating current power supply outputs alternating voltage, and the power supply circuit at least comprises: a power input terminal for receiving an alternating voltage; the filtering unit is connected with the power supply input end and used for filtering noise of alternating-current voltage; the main circuit is connected with the filtering unit and the load and used for converting the filtered alternating current voltage into output direct current voltage and transmitting the output direct current voltage to the load; and the capacitance energy discharge circuit is connected with the power input end, the filtering unit and the common contact and used for detecting whether the power input end receives alternating voltage or not, and when the detection result is negative, the electric energy stored by the filtering unit is released. The power supply circuit of the invention not only accords with the standard defined by the safety standard, but also can reduce the power loss, and further develops towards the direction of saving energy, reducing the loss and improving the efficiency.

Description

Can reduce the capacitive energy discharge circuit and the power supply circuit thereof of the loss of power
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.
Discharge loop controller 212 can be made up of drive circuit 213 and AC power testing circuit 214, and wherein AC power testing circuit 214 comprises test side 21a, the first output 214a and the second output 214b.Test side 21a is connected with the power input 2a of power supply circuit 2, the first output 214a and the second output 214b then are connected with the first input end 213a and the second input 213b of drive circuit 213 respectively, and whether the power input 2a that AC power testing circuit 214 is mainly used to detect power supply circuit 2 receives alternating voltage V Ac, be output as the first detection signal V of negative value in the first output 214a with the foundation testing result n, in the second output 214b be output as on the occasion of the second detection signal V p
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.
Second discharge circuit 611 then has the 3rd discharge end 61c and the second discharge resistance R 9', the 3rd discharge end 61c and storage capacitor C 7Positive input terminal connect the second discharge resistance R 9' be connected with the first conduction of current end 211a of the 3rd discharge end 61c and switching circuit 211, second discharge circuit 611 forms another discharge loops with switching circuit 211, with the discharge energy-storage capacitor C in order to when switching circuit 211 conductings 7Institute's electric energy stored.
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)

1.一种电源供应电路，其与一交流电源及一负载连接，该交流电源输出一交流电压，至少包含：1. A power supply circuit, which is connected to an AC power supply and a load, and the AC power supply outputs an AC voltage, at least comprising: 一电源输入端，用以接收该交流电压；a power input terminal for receiving the AC voltage; 一滤波单元，与该电源输入端连接，用以滤除该交流电压的噪声；a filter unit connected to the input terminal of the power supply to filter out the noise of the AC voltage; 一主要电路，与该滤波单元及该负载连接，用以将滤波后的该交流电压转换成一输出直流电压，并传送至该负载；以及A main circuit, connected to the filter unit and the load, is used to convert the filtered AC voltage into an output DC voltage and transmit it to the load; and 一电容能量放电电路，与该电源输入端、该滤波单元及一共接点连接，用以检测该电源输入端是否接收到该交流电压，当检测结果为否时，释放该滤波单元所存储的电能。A capacitive energy discharge circuit is connected with the power input terminal, the filter unit and a common contact, and is used to detect whether the power input terminal receives the AC voltage, and release the electric energy stored in the filter unit when the detection result is negative. 2.如权利要求1所述的电源供应电路，其中该电容能量放电电路包含：2. The power supply circuit as claimed in claim 1, wherein the capacitive energy discharging circuit comprises: 一开关电路，具有一第一电流传导端及一第二电流传导端，该第二电流传导端与该共接点连接：A switch circuit has a first current conduction terminal and a second current conduction terminal, the second current conduction terminal is connected to the common contact point: 一放电电路，与该滤波单元及该第一电流传导端连接，用以于该开关电路导通时，释放该滤波单元所存储的电能；以及a discharge circuit, connected to the filter unit and the first current conducting terminal, for releasing the electric energy stored in the filter unit when the switch circuit is turned on; and 一放电回路控制器，与该电源输入端以及该开关电路的一控制端连接，用以检测该电源输入端是否接收到该交流电压，以控制该开关电路于该电源输入端接收到该交流电压时截止，于该电源供应电路未接收到该交流电压时导通。A discharge loop controller, connected to the power supply input terminal and a control terminal of the switch circuit, is used to detect whether the power supply input terminal receives the AC voltage, so as to control the switch circuit to receive the AC voltage at the power supply input terminal cut off when the power supply circuit does not receive the AC voltage. 3.如权利要求2所述的电源供应电路，其中该开关电路为一结型场效应晶体管或是一金属氧化物半导体场效应晶体管。3. The power supply circuit as claimed in claim 2, wherein the switch circuit is a junction field effect transistor or a metal oxide semiconductor field effect transistor. 4.如权利要求2所述的电源供应电路，其中该放电电路包含：4. The power supply circuit as claimed in claim 2, wherein the discharging circuit comprises: 一第一放电二极管，其与该滤波单元的正输入端连接；A first discharge diode, which is connected to the positive input end of the filter unit; 一第二放电二极管，其与该滤波单元的负输入端连接；以及a second discharge diode connected to the negative input of the filtering unit; and 一放电电阻，其与该第一放电二极管、该第二放电二极管以及该开关电路的该第一电流传导端连接。A discharge resistor is connected with the first discharge diode, the second discharge diode and the first current conducting end of the switch circuit. 5.如权利要求2所述的电源供应电路，其中该放电回路控制器包含：5. The power supply circuit as claimed in claim 2, wherein the discharge loop controller comprises: 一交流电源检测电路，与该电源输入端连接，其检测该电源输入端是否接收到该交流电压，并依检测结果输出一第一检测信号。An AC power detection circuit is connected with the power input end, which detects whether the power input end receives the AC voltage, and outputs a first detection signal according to the detection result. 6.如权利要求5所述的电源供应电路，其中，当该电源输入端接收到该交流电压时，该第一检测信号为一负值，而当该电源输入端未接收到该交流电压时，该第一检测信号由该负值朝零提升。6. The power supply circuit as claimed in claim 5, wherein, when the power input terminal receives the AC voltage, the first detection signal is a negative value, and when the power input terminal does not receive the AC voltage , the first detection signal increases from the negative value toward zero. 7.如权利要求5所述的电源供应电路，其中该放电回路控制器还包含：7. The power supply circuit as claimed in claim 5, wherein the discharge loop controller further comprises: 一驱动电路，与该开关电路的该控制端、该交流电源检测电路以及该共接点连接，其接收该第一检测信号及一第二检测信号，并依据该第一检测信号而控制该开关电路的动作；A drive circuit, connected to the control terminal of the switch circuit, the AC power detection circuit and the common contact, receives the first detection signal and a second detection signal, and controls the switch circuit according to the first detection signal Actions; 其中，当该驱动电路通过该第一检测信号判断得知该电源输入端接收到该交流电压时，该驱动电路控制该开关电路截止，当该驱动电路通过该第一检测信号判断得知该电源输入端未接收到该交流电压时，该驱动电路将该第二检测信号传送至该开关电路的该控制端，以控制该开开电路导通。Wherein, when the drive circuit judges through the first detection signal that the input terminal of the power supply receives the AC voltage, the drive circuit controls the switch circuit to cut off, and when the drive circuit judges through the first detection signal that the power supply When the input terminal does not receive the AC voltage, the drive circuit transmits the second detection signal to the control terminal of the switch circuit to control the on-off circuit to conduct. 8.如权利要求7所述的电源供应电路，其中该交流电源检测电路包含：8. The power supply circuit as claimed in claim 7, wherein the AC power detection circuit comprises: 一第一分压电容，与该电源输入端连接；A first voltage dividing capacitor connected to the power supply input terminal; 一第一整流二极管，与该第一分压电容连接；以及a first rectifier diode connected to the first voltage dividing capacitor; and 一第二分压电容，与该第一整流二极管连接；a second voltage dividing capacitor connected to the first rectifier diode; 其中，当该电源输入端接收该交流电压，且于负半周循环期间，该交流电压经该第一分压电容及该第一整流二极管对该第二分压电容充电，使得该第二分压电容产生该第一检测信号。Wherein, when the power supply input terminal receives the AC voltage, and during the negative half cycle period, the AC voltage charges the second voltage dividing capacitor through the first voltage dividing capacitor and the first rectifier diode, so that the second voltage dividing capacitor The capacitor generates the first detection signal. 9.如权利要求8所述的电源供应电路，其中该交流电源检测电路还包含：9. The power supply circuit as claimed in claim 8, wherein the AC power detection circuit further comprises: 一第二整流二极管，与该第一分压电容连接；以及a second rectifier diode connected to the first voltage dividing capacitor; and 一第三分压电容，与该第二整流二极管连接；a third voltage dividing capacitor connected to the second rectifier diode; 其中，当该电源输入端接收到该交流电压，且于正半周循环期间，该交流电压经该第一分压电容及该第二整流二极管对该第三分压电容充电，使该第三分压电容产生该第二检测信号。Wherein, when the power supply input terminal receives the AC voltage, and during the positive half cycle period, the AC voltage charges the third voltage dividing capacitor through the first voltage dividing capacitor and the second rectifier diode, so that the third voltage dividing capacitor The piezocapacitor generates the second detection signal. 10.如权利要求9所述的电源供应电路，其中该交流电源检测电路还包含：10. The power supply circuit as claimed in claim 9, wherein the AC power detection circuit further comprises: 一第一稳压电阻，其与该第二分压电容连接，用以稳定该第一检测信号的电压电平；以及a first voltage stabilizing resistor connected to the second voltage dividing capacitor for stabilizing the voltage level of the first detection signal; and 一第二稳压电阻，其与该第三分压电容连接，用以稳定该第二检测信号的电压电平。A second voltage stabilizing resistor is connected with the third voltage dividing capacitor for stabilizing the voltage level of the second detection signal. 11.如权利要求9所述的电源供应电路，其中该驱动电路包含：11. The power supply circuit as claimed in claim 9, wherein the driving circuit comprises: 一脉冲电容，与该第二分压电容连接并接收该第一检测信号；a pulse capacitor connected to the second voltage dividing capacitor and receiving the first detection signal; 一压差二极管，其两端分别与该脉冲电容及该共接点连接；a dropout diode, the two ends of which are respectively connected to the pulse capacitor and the common contact; 一第一限流电阻，与该脉冲电容连接；A first current limiting resistor connected to the pulse capacitor; 一NPN双极结型晶体管，其基极及发射极分别连接于该第一限流电阻及该共接点；An NPN bipolar junction transistor, the base and the emitter of which are respectively connected to the first current limiting resistor and the common contact; 一第二限流电阻，与该NPN双极结型晶体管的集电极连接；以及a second current limiting resistor connected to the collector of the NPN bipolar junction transistor; and 一PNP双极结型晶体管，其基极、发射极及集电极分别与该第二限流电阻、该第三分压电容及该开关电路的该控制端连接；A PNP bipolar junction transistor, its base, emitter and collector are respectively connected to the second current limiting resistor, the third voltage dividing capacitor and the control terminal of the switch circuit; 其中，于该电源输入端接收该交流电压时，该第一检测信号经该脉冲电容及该第一限流电阻驱动该NPN双极结型晶体管及该PNP双极结型晶体管截止，以驱使该开关电路截止，而于该电源输入端未接收到该交流电压时，该脉冲电容转换该第一检测信号为一正脉冲信号，以驱动该NPN双极结型晶体管及该PNP双极结型晶体管导通，以使该第二检测信号经该PNP双极结型晶体管驱动该开关电路导通。Wherein, when the power supply input terminal receives the AC voltage, the first detection signal drives the NPN bipolar junction transistor and the PNP bipolar junction transistor to cut off through the pulse capacitor and the first current limiting resistor, so as to drive the The switch circuit is turned off, and when the AC voltage is not received at the power supply input terminal, the pulse capacitor converts the first detection signal into a positive pulse signal to drive the NPN bipolar junction transistor and the PNP bipolar junction transistor is turned on, so that the second detection signal drives the switch circuit to be turned on through the PNP bipolar junction transistor. 12.如权利要求11所述的电源供应电路，其中该驱动电路还包含：12. The power supply circuit as claimed in claim 11, wherein the driving circuit further comprises: 一第三稳压电阻，连接于该PNP双极结型晶体管的基极及发射极之间，用以稳定该PNP双极结型晶体管的动作状态。A third stabilizing resistor is connected between the base and the emitter of the PNP bipolar junction transistor to stabilize the operating state of the PNP bipolar junction transistor. 13.如权利要求11所述的电源供应电路，其中该驱动电路还包含：13. The power supply circuit as claimed in claim 11, wherein the driving circuit further comprises: 一第四稳压电阻，连接于该PNP双极结型晶体管的集电极及该开关电路的该控制端之间，用以稳定该开关电路的动作状态。A fourth stabilizing resistor is connected between the collector of the PNP bipolar junction transistor and the control terminal of the switch circuit to stabilize the operating state of the switch circuit. 14.如权利要求7所述的电源供应电路，其中该第二检测信号由该交流电源检测电路所输出，且当该电源输入端接收到该交流电压时，该第二检测信号为正值，而当该电源输入端未接收到该交流电压时，该第二检测信号由该正值朝零下降。14. The power supply circuit as claimed in claim 7, wherein the second detection signal is output by the AC power detection circuit, and when the power input terminal receives the AC voltage, the second detection signal is positive, And when the power input end does not receive the AC voltage, the second detection signal decreases from the positive value toward zero. 15.如权利要求5所述的电源供应电路，其中该放电回路控制器还包含：15. The power supply circuit as claimed in claim 5, wherein the discharge loop controller further comprises: 一驱动电路，与该开关电路的该控制端、该交流电源检测电路以及该共接点连接，其接收该第一检测信号及一辅助电源，并依据该第一检测信号而控制该开关电路的动作；A drive circuit, connected to the control terminal of the switch circuit, the AC power supply detection circuit and the common contact, receives the first detection signal and an auxiliary power supply, and controls the operation of the switch circuit according to the first detection signal ; 其中，当该驱动电路通过该第一检测信号判断得知该电源输入端接收到该交流电压时，该驱动电路控制该开关电路截止，当该驱动电路通过该第一检测信号判断得知该电源输入端未接收到该交流电压时，该驱动电路将该辅助电源传送至该开关电路的该控制端，以控制该开开电路导通。Wherein, when the drive circuit judges through the first detection signal that the input terminal of the power supply receives the AC voltage, the drive circuit controls the switch circuit to cut off, and when the drive circuit judges through the first detection signal that the power supply When the input end does not receive the AC voltage, the drive circuit transmits the auxiliary power supply to the control end of the switch circuit to control the on-off circuit to conduct. 16.如权利要求15所述的电源供应电路，其中该辅助电源提供一正电压。16. The power supply circuit as claimed in claim 15, wherein the auxiliary power supply provides a positive voltage. 17.如权利要求2所述的电源供应电路，其中该主要电路包含：17. The power supply circuit as claimed in claim 2, wherein the main circuit comprises: 一整流电路，与该滤波单元连接，用以将经该滤波单元滤波后的该交流电压整流成一过渡直流电压。A rectification circuit, connected with the filter unit, is used to rectify the AC voltage filtered by the filter unit into a transitional DC voltage. 18.如权利要求17所述的电源供应电路，其中该主要电路还包含：18. The power supply circuit as claimed in claim 17, wherein the main circuit further comprises: 一转换电路，连接于该整流电路以及该负载之间，用以接收该过渡直流电压，并依据该负载所需的工作电压而将该过渡直流电压转换为该输出直流电压。A converting circuit, connected between the rectifying circuit and the load, is used to receive the transitional DC voltage and convert the transitional DC voltage into the output DC voltage according to the working voltage required by the load. 19.如权利要求17所述的电源供应电路，其中该整流电路为一桥式整流器。19. The power supply circuit as claimed in claim 17, wherein the rectification circuit is a bridge rectifier. 20.如权利要求1所述的电源供应电路，其中该滤波单元为电容。20. The power supply circuit as claimed in claim 1, wherein the filtering unit is a capacitor. 21.一种电源供应电路，其与一交流电源及一负载连接，该交流电源输出一交流电压，至少包含：21. A power supply circuit, which is connected to an AC power supply and a load, and the AC power supply outputs an AC voltage, at least comprising: 一电源输入端，用以接收该交流电压；a power input terminal for receiving the AC voltage; 一滤波单元，与该电源输入端连接，用以滤除该交流电压的噪声；a filter unit connected to the input terminal of the power supply to filter out the noise of the AC voltage; 一主要电路，与该滤波单元以及该负载连接，用以将滤波后的该交流电压转换为一输出直流电压，且包含一整流电路，该整流电路与该滤波单元连接，用以将滤波后的该交流电压整流成一过渡直流电压；以及A main circuit, connected to the filter unit and the load, is used to convert the filtered AC voltage into an output DC voltage, and includes a rectifier circuit connected to the filter unit, used to convert the filtered AC voltage to an output DC voltage the AC voltage is rectified into a transitional DC voltage; and 一电容能量放电电路，与该电源输入端、该整流电路及一共接点连接，用以检测该电源输入端是否接收到该交流电压，并当检测结果为否时，经该整流电路放电该滤波单元所存储的电能。A capacitive energy discharge circuit, connected to the power input terminal, the rectifier circuit and a common contact, used to detect whether the power input terminal receives the AC voltage, and when the detection result is negative, discharge the filter unit through the rectifier circuit stored electrical energy. 22.如权利要求21所述的电源供应电路，其中该电容能量放电电路包含：22. The power supply circuit as claimed in claim 21, wherein the capacitive energy discharging circuit comprises: 一开关电路，具有一第一电流传导端及一第二电流传导端，该第二电流传导端与该共接点连接：A switch circuit has a first current conduction terminal and a second current conduction terminal, the second current conduction terminal is connected to the common contact point: 一放电电路，与该整流电路以及该第一电流传导端连接，用以于该开关电路导通时，放电该滤波单元所存储的电能；a discharge circuit, connected to the rectifier circuit and the first current conducting end, for discharging the electric energy stored in the filter unit when the switch circuit is turned on; 一放电回路控制器，与该电源输入端以及该开关电路的一控制端连接，用以检测该电源供应电路是否接收到该交流电压，以控制该开关电路于该电源输入端接收该交流电压时截止，于该电源输入端停止接收到该交流电压时导通。A discharge loop controller, connected to the power input terminal and a control terminal of the switch circuit, is used to detect whether the power supply circuit receives the AC voltage, so as to control the switch circuit when the power supply input terminal receives the AC voltage cut off, and turn on when the power supply input terminal stops receiving the AC voltage. 23.如权利要求22所述的电源供应电路，其中该放电电路包含一放电电阻，该放电电阻与该整流电路以及该开关电路的该第一电流传导端连接。23. The power supply circuit as claimed in claim 22, wherein the discharge circuit comprises a discharge resistor connected to the rectifier circuit and the first current conducting end of the switch circuit. 24.如权利要求21所述的电源供应电路，其中该主要电路更具有一储能单元，其连接于该整流电路及该负载之间，并与该电容能量放电电路连接，用以对该过渡直流电压进行稳压，且于该电源输入端停止接收到该交流电压时，通过该电容能量放电电路放电本身所存储的电能。24. The power supply circuit as claimed in claim 21, wherein the main circuit further has an energy storage unit, which is connected between the rectifier circuit and the load, and is connected with the capacitor energy discharge circuit for the transition The DC voltage is stabilized, and when the power supply input terminal stops receiving the AC voltage, the electric energy stored by itself is discharged through the capacitor energy discharge circuit. 25.如权利要求24所述的电源供应电路，其中该储能单元为电容。25. The power supply circuit as claimed in claim 24, wherein the energy storage unit is a capacitor. 26.如权利要求21所述的电源供应电路，其中该滤波单元为电容。26. The power supply circuit as claimed in claim 21, wherein the filtering unit is a capacitor. 27.一种电源供应电路，其与一交流电源及一负载连接，该交流电源输出一交流电压，至少包含：27. A power supply circuit, which is connected to an AC power source and a load, and the AC power source outputs an AC voltage, at least comprising: 一电源输入端，用以接收该交流电压；a power input terminal for receiving the AC voltage; 一滤波单元，与该电源输入端连接，用以滤除该交流电压的噪声；a filter unit connected to the input terminal of the power supply to filter out the noise of the AC voltage; 一主要电路，与该滤波单元以及该负载连接，用以将滤波后的该交流电压转换为一输出直流电压，且包含一整流电路以及一储能单元，该整流电路连接于该滤波单元以及该储能单元之间，用以将滤波后的该交流电压整流成一过渡直流电压；以及A main circuit, connected to the filter unit and the load, is used to convert the filtered AC voltage into an output DC voltage, and includes a rectifier circuit and an energy storage unit, and the rectifier circuit is connected to the filter unit and the between the energy storage units for rectifying the filtered AC voltage into a transitional DC voltage; and 一电容能量放电电路，与该电源输入端、该滤波单元、该整流电路、该储能单元及一共接点连接，用以检测该电源输入端是否接收到该交流电压，并当检测结果为否时，放电该滤波单元及该储能单元所存储的电能。A capacitive energy discharge circuit, connected to the power input terminal, the filter unit, the rectifier circuit, the energy storage unit and a common contact, for detecting whether the power input terminal receives the AC voltage, and when the detection result is negative , discharging the electric energy stored in the filter unit and the energy storage unit. 28.如权利要求27所述的电源供应电路，其中该电容能量放电电路包含：28. The power supply circuit as claimed in claim 27, wherein the capacitive energy discharging circuit comprises: 一开关电路，具有一第一电流传导端及一第二电流传导端，该第二电流传导端与该共接点连接；A switch circuit, having a first current conduction end and a second current conduction end, the second current conduction end is connected to the common contact; 一第一放电电路，与该滤波单元的两端及该第一电流传导端连接，用以于该开关电路导通时，放电该滤波单元所存储的电能；a first discharge circuit, connected to both ends of the filter unit and the first current conducting end, for discharging the electric energy stored in the filter unit when the switch circuit is turned on; 一第二放电电路，与该整流电路、该储能单元的一正输入端以及该第一电流传导端连接，用以于该开关电路导通时，放电该储能单元所存储的电能；以及a second discharge circuit connected to the rectifier circuit, a positive input terminal of the energy storage unit and the first current conducting terminal, for discharging the electric energy stored in the energy storage unit when the switch circuit is turned on; and 一放电回路控制器，与该电源输入端以及该开关电路的一控制端连接，用以检测该电源供应电路是否接收到该交流电压，以控制该开关电路于该电源输入端接收该交流电压时截止，于该电源输入端停止接收到该交流电压时导通。A discharge loop controller, connected to the power supply input terminal and a control terminal of the switch circuit, is used to detect whether the power supply circuit receives the AC voltage, so as to control the switch circuit when the power supply input terminal receives the AC voltage cut off, and turn on when the power supply input terminal stops receiving the AC voltage. 29.如权利要求27所述的电源供应电路，其中该滤波单元及储能单元都为电容。29. The power supply circuit as claimed in claim 27, wherein both the filter unit and the energy storage unit are capacitors. 30.一种电容能量放电电路，应用于一电源供应电路中，其中该电源供应电路的一电源输入端与一交流电源连接，且具有一滤波单元，该电容能量放电电路包含：30. A capacitive energy discharge circuit, applied to a power supply circuit, wherein a power input end of the power supply circuit is connected to an AC power supply, and has a filter unit, the capacitive energy discharge circuit includes: 一开关电路，具有一第一电流传导端及一第二电流传导端，该第二电流传导端与一共接点连接；A switch circuit, having a first current conduction terminal and a second current conduction terminal, the second current conduction terminal is connected to a common contact; 一放电电路，与该滤波单元及该第一电流传导端连接，用以于该开关电路导通时，放电该滤波单元所存储的电能；以及a discharge circuit, connected to the filter unit and the first current conducting terminal, for discharging the electric energy stored in the filter unit when the switch circuit is turned on; and 一放电回路控制器，与该电源输入端以及该开关电路的一控制端连接，用以检测该电源输入端是否接收到该交流电源所输出的一交流电压，以控制该开关电路于该电源输入端接收到该交流电压时截止，于该电源供应电路未接收到该交流电压时导通。A discharge loop controller, connected with the power supply input terminal and a control terminal of the switch circuit, is used to detect whether the power supply input terminal receives an AC voltage output by the AC power supply, so as to control the switch circuit at the power supply input The terminal is cut off when receiving the AC voltage, and is turned on when the power supply circuit does not receive the AC voltage.
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