CN207638553U - A kind of inverse-excitation type switch power-supply circuit - Google Patents
A kind of inverse-excitation type switch power-supply circuit Download PDFInfo
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- CN207638553U CN207638553U CN201721881633.3U CN201721881633U CN207638553U CN 207638553 U CN207638553 U CN 207638553U CN 201721881633 U CN201721881633 U CN 201721881633U CN 207638553 U CN207638553 U CN 207638553U
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Abstract
The utility model discloses a kind of inverse-excitation type switch power-supply circuits, including：Electrical energy conversion circuit, pwm control circuit, switching circuit and switch discharge circuit；The input terminal of switching circuit is connected with the output end of pwm control circuit, and the output end of switching circuit is connected with the input terminal of electrical energy conversion circuit；The input terminal of switch discharge circuit is connected with the output end of switching circuit, and the output end of switch discharge circuit is connected with the input terminal of pwm control circuit；The control signal that switching circuit is used to be sent according to pwm control circuit controls the break-make of electrical energy conversion circuit；The electricity that switch discharge circuit generates when being turned off for release switch circuit.The energy stored after switching circuit turns off every time can be reduced, reduces the possibility that switching circuit is generated heat due to energy storage, improves the service life of switching circuit.
Description
Technical field
The utility model is related to switch power technology field more particularly to a kind of inverse-excitation type switch power-supply circuits.
Background technology
Switching Power Supply is that the voltage of a standard is converted to the required voltage of user terminal through various forms of frameworks
Or a kind of power supply of electric current, and inverse-excitation type switch power-supply is the switch using flyback high frequency transformer isolation input output loop
Power supply.The waveform that the switching power source chip of inverse-excitation type switch power-supply is exported according to the adjustment of the feedback signal of voltage change, including account for
The adjustment of empty ratio or the adjustment of frequency, and then make the voltage of main output loop to opposite direction change is changed before, ensure
The stability of output loop output.
In the prior art, the Chinese patent literature of Publication No. CN204442186U discloses a kind of reverse exciting switching voltage regulator electricity
Road, including ac rectifier, electromagnetic interference filter circuit, start-up circuit, flyback switching circuit, output rectifier and filter,
Control circuit and feedback circuit.Wherein, flyback switching circuit includes flyback transformer and power tube.In above patent document
Power tube is connected with control circuit, and repeats to cut-off to form switching circuit under the control of control circuit, to control flyback
Transformer is cut-off, still, since power tube and control circuit are directly connected to, when power tube is in the control of control circuit
Under when being converted to shutdown from unlatching, the capacitance integrated on power tube can not discharge, and may result in power tube fever, shorten power
The generation of the problem of service life of pipe.
Utility model content
It is generated when therefore, the technical problem to be solved by the present invention is to solve switching circuit shutdown in the prior art
Electricity can not discharge, switching circuit may be caused to generate heat, the shorter problem of service life.
For this purpose, the utility model provides a kind of inverse-excitation type switch power-supply circuit, including：Electrical energy conversion circuit, PWM controls
Circuit, switching circuit and switch discharge circuit；The input terminal of switching circuit is connected with the output end of pwm control circuit, switch
The output end of circuit is connected with the input terminal of electrical energy conversion circuit, the output of the input terminal and switching circuit of switch discharge circuit
End is connected, and the output end of switch discharge circuit is connected with the input terminal of pwm control circuit；Switching circuit is used for according to PWM
The break-make for the control signal control electrical energy conversion circuit that control circuit is sent；Switch discharge circuit is turned off for release switch circuit
When the electricity that generates.
Optionally, switching circuit is OSFET pipes Q1；Switch discharge circuit includes：First resistor R1 and the first diode
D1；One end of first resistor R1 is connected with the grid of MOSFET pipes Q1, and the other end is connected with the anode of the first diode D1；
The cathode of first diode D1 is connected with pwm control circuit.
Optionally, switch discharge circuit further includes：One end of second resistance R2, second resistance R2 and first resistor R1 and
The grid of MOSFET pipes Q1 is connected, and the other end is connected with the cathode of the first diode D1 and pwm control circuit.
Optionally, switch discharge circuit further includes：One end of 3rd resistor R3,3rd resistor R3 and second resistance R2, the
One resistance R1 is connected with the grid of MOSFET pipes Q1, the other end ground connection of 3rd resistor R3.
Optionally, electrical energy conversion circuit includes input circuit, transformer circuit and output circuit；The input of transformer circuit
End is connected with the output end of the output end of input circuit and switching circuit, the output end of transformer circuit and output circuit
Input terminal is connected；Inverse-excitation type switch power-supply circuit further includes start-up circuit, the input terminal of start-up circuit and input circuit it is defeated
Outlet is connected, and the output end of start-up circuit is connected with the input terminal of pwm control circuit；Start-up circuit is used to open when inverse-excitation type
When powered-down source circuit starts, power to pwm control circuit.
Optionally, start-up circuit includes：4th resistance R4, the first capacitance C1 and the second capacitance C2；The one of 4th resistance R4
End is connected with input circuit, and the other end is connected with the first capacitance C1, the second capacitance C2 and pwm control circuit；First capacitance
The other end of C1 and the second capacitance C2 are grounded.
Optionally, pwm control circuit includes：Preferred circuit, feedback circuit and pwm chip；The input of preferred circuit
End is connected with the output end of output circuit, the output end of preferred circuit and the input terminal of output circuit and feedback circuit it is defeated
Enter end to be connected；Preferred circuit is used for the voltage of stabilizing output circuit, and the voltage value of output circuit is sent to feedback circuit；
The output end of feedback circuit is connected with the input terminal of pwm chip；Feedback circuit is used for the voltage value of output circuit is anti-
It is fed to pwm chip.
Optionally, preferred circuit includes：Reference voltage source U1, the 5th resistance R5 and the 6th resistance R6；Reference voltage source U1
The first pin be connected with feedback circuit, second pin is connected with the 6th resistance R6 and ground wire, third pin and the 6th electricity
The other end and the 5th resistance R5 for hindering R6 are connected；The other end of 5th resistance R5 is connected with output circuit.
Optionally, input circuit includes ripple filter circuit, and ripple filter circuit includes：The electricity of third capacitance C3 and the 7th
Hinder R7；One end of third capacitance C3 is connected with fire line terminal, and the other end is connected with zero terminal；7th resistance R7 and third
Capacitance C3 is in parallel.
Technical solution provided by the utility model, has the following advantages that：
1, inverse-excitation type switch power-supply circuit provided by the utility model, including：Electrical energy conversion circuit, PWM control circuits,
Switching circuit and switch discharge circuit；The input terminal of switching circuit is connected with the output end of pwm control circuit, switching circuit
Output end is connected with the input terminal of electrical energy conversion circuit, and the input terminal of switch discharge circuit is connected with the output end of switching circuit
It connects, the output end of switch discharge circuit is connected with the input terminal of pwm control circuit；Switching circuit is used to control electricity according to PWM
The break-make for the control signal control electrical energy conversion circuit that road is sent；Switch discharge circuit generates when being turned off for release switch circuit
Electricity.By the way that the switch discharge circuit being connected with switching circuit, the electricity that split powered-down road generates after turning off every time is arranged
Amount is discharged, it is thus possible to be reduced the energy stored after switching circuit turns off every time, be reduced switching circuit and sent out due to energy storage
The possibility of heat, improves the service life of switching circuit, additionally it is possible to reduce the electricity stored on switching circuit to switch
The subsequent influence for cut-offfing generation of circuit, improves the performance of the inverse-excitation type switch power-supply circuit.
2, inverse-excitation type switch power-supply circuit provided by the utility model, electrical energy conversion circuit include input circuit, transformer
Circuit and output circuit；The input terminal of transformer circuit is connected with the output end of the output end of input circuit and switching circuit
It connects, the output end of transformer circuit is connected with the input terminal of output circuit；Inverse-excitation type switch power-supply circuit further includes starting electricity
Road, the input terminal of start-up circuit are connected with the output end of input circuit, the output end of start-up circuit and pwm control circuit it is defeated
Enter end to be connected；Start-up circuit is used for when inverse-excitation type switch power-supply circuit starts, and is powered to pwm control circuit.Pass through setting
The start-up circuit being connected with input circuit and pwm control circuit, realize when the inverse-excitation type switch power-supply circuit just starts,
It is directly taken from input circuit treated signal and supplies electricity to pwm control circuit power supply, it is rigid to solve inverse-excitation type switch power-supply circuit
When startup, the problem of transformer circuit can not power to pwm control circuit, need external power supply, circuit structure is simplified.
3, inverse-excitation type switch power-supply circuit provided by the utility model, pwm control circuit include：Preferred circuit, feedback electricity
Road and pwm chip；The input terminal of preferred circuit is connected with the output end of output circuit, the output end of preferred circuit with it is defeated
The input terminal of the input terminal and feedback circuit that go out circuit is connected；Preferred circuit is used for the voltage of stabilizing output circuit, and will
The voltage value of output circuit is sent to feedback circuit；The output end of feedback circuit is connected with the input terminal of pwm chip；Instead
Current feed circuit is used to the voltage value of output circuit feeding back to pwm chip.By the way that preferred circuit is arranged, output electricity can be stablized
The output voltage on road improves the performance of the inverse-excitation type switch power-supply circuit, meanwhile, preferred circuit will export electricity by feedback circuit
The situation of change of the voltage value on road feeds back to pwm chip so that pwm chip can generate phase according to the situation of change
Anti- variation adjusts the turn-on time of transformer circuit, so as to which the voltage value of output circuit is adjusted to default output electricity
Pressure value.
4, inverse-excitation type switch power-supply circuit provided by the utility model, input circuit include ripple filter circuit, ripple filter
Wave circuit includes：Third capacitance C3 and the 7th resistance R7；One end of third capacitance C3 is connected with fire line terminal, the other end and zero
Line terminals are connected, and the 7th resistance R7 is in parallel with third capacitance C3.By on the third capacitance C3 in ripple filter circuit simultaneously
It is combined the 7th resistance R7 in partial pressure, the breakdown possibilities of third capacitance C3 can be reduced, improves the use of third capacitance C3
Service life.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific implementation mode or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of structural schematic diagram for inverse-excitation type switch power-supply circuit that the utility model embodiment provides；
Fig. 2 is the structure of electrical energy conversion circuit in a kind of inverse-excitation type switch power-supply circuit that the utility model embodiment provides
Schematic diagram；
Fig. 3 is a kind of circuit diagram for inverse-excitation type switch power-supply circuit that the utility model embodiment provides；
Fig. 4 is the structure of pwm control circuit in a kind of inverse-excitation type switch power-supply circuit that the utility model embodiment provides
Schematic diagram；
Reference sign：
1- electrical energy conversion circuits；11- input circuits；12- transformer circuits；13- output circuits；
2-PWM control circuits；21- preferred circuits；22- feedback circuits；23-PWM controls chip；
3- switching circuits；4- switch discharge circuits；5- start-up circuits.
Specific implementation mode
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
The every other embodiment that field those of ordinary skill is obtained without making creative work, belongs to this practicality
Novel protected range.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements, can be wirelessly connected, can also be wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.In addition, term " first ", " second "
Etc. being used for description purposes only, it is not understood to indicate or imply relative importance.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can be combined with each other.
A kind of inverse-excitation type switch power-supply circuit is present embodiments provided, as shown in Figure 1, including：Electrical energy conversion circuit 1, PWM
Control circuit 2, switching circuit 3 and switch discharge circuit 4；The output end phase of the input terminal of switching circuit 3 and pwm control circuit 2
Connection, the output end of switching circuit 3 is connected with the input terminal of electrical energy conversion circuit 1, the input terminal of switch discharge circuit 4 with open
The output end on powered-down road 3 is connected, and the output end of switch discharge circuit 4 is connected with the input terminal of pwm control circuit 2；Switch
The control signal that circuit 3 is used to be sent according to pwm control circuit 2 controls the break-make of electrical energy conversion circuit 1；Switch discharge circuit 4
The electricity generated when being turned off for release switch circuit 3.
Inverse-excitation type switch power-supply circuit in the present embodiment, by the way that the switch discharge being connected with switching circuit 3 electricity is arranged
Road 4 discharges the electricity generated after being turned off every time on switching circuit 3, it is thus possible to after reducing each shutdown of switching circuit 3
The energy of storage reduces the possibility that switching circuit 3 is generated heat due to energy storage, improves the service life of switching circuit 3, this
Outside, additionally it is possible to reduce the electricity stored on switching circuit 3 the influence for cut-offfing generation subsequent to switching circuit 3, it is anti-to improve this
The performance of excitation type switch power-supply circuit.
In the present embodiment, as shown in Fig. 2, electrical energy conversion circuit 1 includes：Input circuit 11, transformer circuit 12 and defeated
Go out circuit 13；The input terminal of transformer circuit 12 is connected with the output end of the output end of input circuit 11 and switching circuit 3,
The output end of transformer circuit 12 is connected with the input terminal of output circuit 13.In the present embodiment, input circuit 11 includes：
The input terminal of safety protective circuit, shaping circuit and filter circuit, safety protective circuit is connected with input power, safeguard protection
The output end of circuit is connected with the input terminal of shaping circuit；The output end of shaping circuit is connected with the input terminal of filter circuit
It connects；The output end of filter circuit is connected with transformer circuit 12.
In a particular embodiment, safety protective circuit can be fusible link, gas-discharge tube (Gas Discharge
Tube, GDT), transient voltage suppressor (Transient Voltage Suppressor, TVS), EMI Filtering
One or more in device, thermistor or varistor etc., specifically, the set-up mode of safety protective circuit can basis
The demand of practical application scene determines.
In a particular embodiment, shaping circuit can be anti-reverse diode, half-wave rectifier bridge or full-wave rectification bridge, tool
Body, when input power is direct current, shaping circuit can not connect, take over control reversal connection diode or connect full-wave rectification bridge, when
When input power is alternating current, shaping circuit can be half-wave rectifier bridge or full-wave rectification bridge.In a particular embodiment, it filters
Circuit includes ripple filter circuit and/or differential mode filter circuit and/or common mode filtering circuit, specifically, differential mode filter circuit
Can be filter capacitor, common mode filtering circuit can be common-mode filter.In a particular embodiment, as shown in figure 3, ripple filters
Circuit includes：Third capacitance C3 and the 7th resistance R7；One end of third capacitance C3 is connected with fire line terminal, the other end and zero curve
Terminal is connected, and the 7th resistance R7 is in parallel with third capacitance C3, and specifically, third capacitance C3 can be one or more concatenated
Capacitance, when third capacitance C3 is multiple concatenated capacitances, the 7th resistance R7 is correspondingly arranged with third capacitance C3, i.e., and each the
Three both ends capacitance C3 are parallel with the 7th resistance R7.By in parallel for dividing on the third capacitance C3 in ripple filter circuit
7th resistance R7 of pressure can reduce the breakdown possibilities of third capacitance C3, improve the service life of third capacitance C3.
In the present embodiment, as shown in figure 4, pwm control circuit 2 includes：Preferred circuit 21, feedback circuit 22 and PWM controls
Coremaking piece 23；The input terminal of preferred circuit 21 is connected with the output end of output circuit 13, the output end of preferred circuit 21 with it is defeated
The input terminal of the input terminal and feedback circuit 22 that go out circuit 13 is connected；Preferred circuit 21 is used for the electricity of stabilizing output circuit 13
Pressure, and the voltage value of output circuit 13 is sent to feedback circuit 22；The output end of feedback circuit 22 and pwm chip 23
Input terminal is connected；Feedback circuit 22 is used to the voltage value of output circuit 13 feeding back to pwm chip 23.
Inverse-excitation type switch power-supply circuit in the present embodiment being capable of stabilizing output circuit 13 by the way that preferred circuit 21 is arranged
Output voltage, improve the performance of the inverse-excitation type switch power-supply circuit, meanwhile, preferred circuit 21 by feedback circuit 22 will export
The situation of change of the voltage value of circuit 13 feeds back to PWM control chips 23 so that pwm chip 23 can be according to the variation
Situation generates opposite variation, adjusts the turn-on time of transformer circuit 12, so as to by the voltage value tune of output circuit 13
Whole is pre-set output voltage value.
In a particular embodiment, as shown in figure 3, preferred circuit 21 includes：Reference voltage source U1, the 5th resistance R5 and the 6th
Resistance R6；The first pin of reference voltage source U1 is connected with feedback circuit 22, second pin and the 6th resistance R6 and ground wire phase
Connection, third pin are connected with the other end of the 6th resistance R6 and the 5th resistance R5；The other end of 5th resistance R5 with it is defeated
Go out circuit 13 to be connected.
In a particular embodiment, as shown in figure 3, feedback circuit 22 includes：Resistance R8, resistance R9, optocoupler U3 and capacitance C4；
One end of resistance R8 is connected with output circuit 13, and the other end of resistance R8 is connected with the first pin of resistance R9 and optocoupler；
The other end of resistance R9 is connected with the first pin of the second pin of optocoupler and reference voltage source U1；One end of capacitance C4 with
8th pin of pwm chip 23 and the third pin of optocoupler U3 are connected, the other end ground connection of capacitance C4；Optocoupler U3's
4th pin is grounded.In the present embodiment, the first pin of optocoupler U3 refers to the anode of light emitting diode in optocoupler U3；Optocoupler
The second pin of U3 refers to the cathode of light emitting diode in optocoupler U3；The third pin of optocoupler U3 refers to photosensitive three in optocoupler U3
The collector of grade pipe；The 4th pin of optocoupler U3 refers to the emitter of photosensitive triode in optocoupler U3.By the way that feedback electricity is arranged
Road 22 so that when the voltage in output circuit 13 increases, the electric current for flowing through optocoupler U3 increases, and the 8th of pwm chip 23 the
Voltage at pin reduces, and the output duty cycle of pwm chip 23 reduces, i.e., the turn-on time of transformer circuit 12 shortens,
To make the voltage value of output circuit 13 reduce, realizes and the voltage value of output circuit 13 is adjusted to pre-set output voltage value.
In the present embodiment, as shown in figure 3, switching circuit 3 is MOSFET pipe Q1, in a particular embodiment, MOSFET pipes
The grid of Q1 is connected with the 4th pin of pwm chip 23, the primary of the drain electrode and transformer circuit 12 of MOSFET pipes Q1
Winding is connected, the source electrode ground connection of MOSFET pipes Q1.
In the present embodiment, as shown in figure 3, switch discharge circuit 4 includes：First resistor R1 and the first diode D1；The
One end of one resistance R1 is connected with the grid of MOSFET pipes Q1, and the other end is connected with the anode of the first diode D1；First
The cathode of diode D1 is connected with pwm control circuit 2, specifically, cathode and the pwm chip 23 of the first diode D1
4th pin is connected, when first resistor R1 is for discharging the Q1 shutdowns of MOSFET pipes, the integrated electricity on the grid of MOSFET pipes Q1
Hold, prevents MOSFET pipes Q1 from generating heat, meanwhile, so that MOSFET pipes Q1 is exported normal square wave；First diode D1 is anti-reverse two
Pole pipe.In a particular embodiment, switch discharge circuit 4 further includes：Second resistance R2 and 3rd resistor R3；The one of second resistance R2
End is connected with the grid of first resistor R1 and MOSFET pipe Q1, cathode and the PWM control of the other end and the first diode D1
Circuit 2 is connected；One end of 3rd resistor R3 is connected with the grid of second resistance R2, first resistor R1 and MOSFET pipe Q1,
The other end of 3rd resistor R3 is grounded, and specifically, the cathode and PWM of the other end of second resistance R2 and the first diode D1 are controlled
4th pin of coremaking piece 23 is connected, and second resistance R2 and 3rd resistor R3 are for assisting first resistor R1 to discharge MOSFET
Integrated capacitance on the grid of pipe Q1, meanwhile, when MOSFET pipes Q1 is in the conduction state, second resistance R2 can also play limit
The effect of stream, for reducing the excessive possibility for causing MOSFET pipes Q1 breakdown of the electric current on MOSFET pipes Q1.
In an alternate embodiment of the invention, as shown in Figure 2 and Figure 4, inverse-excitation type switch power-supply circuit further includes start-up circuit 5, is opened
The input terminal of dynamic circuit 5 is connected with the output end of input circuit 11, and the output end of start-up circuit 5 is defeated with pwm control circuit 2
Enter end to be connected；Start-up circuit 5 is used for when inverse-excitation type switch power-supply circuit starts, and is powered to pwm control circuit 2.
Inverse-excitation type switch power-supply circuit in the present embodiment passes through setting and input circuit 11 and PWM control circuits 2
The start-up circuit 5 being connected is realized when the inverse-excitation type switch power-supply circuit just starts, from treated the signal of input circuit 11
Place, which directly takes, to be supplied electricity to pwm control circuit 2 and powers, when solving inverse-excitation type switch power-supply circuit and just starting, 12 nothing of transformer circuit
Method gives pwm control circuit 2 to power, and the problem of needing external power supply, simplifies circuit structure.And when inverse-excitation type switch power-supply electricity
After road starts, then powered by the armature winding bio-occlusion pwm control circuit 2 in transformer circuit 12.
In a particular embodiment, as shown in figure 3, start-up circuit 5 includes：4th resistance R4, the first capacitance C1 and the second electricity
Hold C2；One end of 4th resistance R4 is connected with input circuit 11, and the other end and the first capacitance C1, the second capacitance C2 and PWM are controlled
Circuit 2 processed is connected；The other end of first capacitance C1 and the second capacitance C2 are grounded, specifically, one end of the 4th resistance R4 with
Third capacitance C3 in ripple filter circuit is connected, the other end of the 4th resistance R4 and the first capacitance C1, the second capacitance C2 and
The second pin of pwm chip 23 is connected.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
Among changing still in the scope of protection of the utility model.
Claims (9)
1. a kind of inverse-excitation type switch power-supply circuit, which is characterized in that including：Electrical energy conversion circuit (1), pwm control circuit (2),
Switching circuit (3) and switch discharge circuit (4)；
The input terminal of the switching circuit (3) is connected with the output end of the pwm control circuit (2), the switching circuit (3)
Output end be connected with the input terminal of the electrical energy conversion circuit (1)；The input terminal of the switch discharge circuit (4) with it is described
The output end of switching circuit (3) is connected, and the output end of the switch discharge circuit (4) is defeated with the pwm control circuit (2)
Enter end to be connected；
The switching circuit (3), which is used to control the electric energy according to the control signal that the pwm control circuit (2) is sent, converts electricity
The break-make on road (1)；The switch discharge circuit (4) is used to discharge the electricity generated when the switching circuit (3) shutdown.
2. inverse-excitation type switch power-supply circuit according to claim 1, which is characterized in that
The switching circuit (3) is MOSFET pipes Q1；The switch discharge circuit (4) includes：First resistor R1 and the one or two pole
Pipe D1；
One end of the first resistor R1 is connected with the grid of the MOSFET pipes Q1, the other end and the first diode D1
Anode be connected；
The cathode of the first diode D1 is connected with the pwm control circuit (2).
3. inverse-excitation type switch power-supply circuit according to claim 2, which is characterized in that the switch discharge circuit (4) is also
Including：
Second resistance R2, one end of the second resistance R2 are connected with the grid of the first resistor R1 and the MOSFET pipes Q1
It connects, the other end is connected with the cathode of the first diode D1 and the pwm control circuit (2).
4. inverse-excitation type switch power-supply circuit according to claim 3, which is characterized in that the switch discharge circuit (4) is also
Including：
3rd resistor R3, one end of the 3rd resistor R3 and the second resistance R2, the first resistor R1 and described
The grid of MOSFET pipes Q1 is connected, the other end ground connection of the 3rd resistor R3.
5. according to claim 1-4 any one of them inverse-excitation type switch power-supply circuits, which is characterized in that
The electrical energy conversion circuit (1) includes input circuit (11), transformer circuit (12) and output circuit (13)；
The input terminal of the transformer circuit (12) and the output end of the input circuit (11) and the switching circuit (3)
Output end is connected, and the output end of the transformer circuit (12) is connected with the input terminal of the output circuit (13)；
The inverse-excitation type switch power-supply circuit further includes start-up circuit (5), input terminal and the input of the start-up circuit (5)
The output end of circuit (11) is connected, the input terminal phase of the output end and the pwm control circuit (2) of the start-up circuit (5)
Connection；The start-up circuit (5) is used for when the inverse-excitation type switch power-supply circuit starts, and is supplied to the pwm control circuit (2)
Electricity.
6. inverse-excitation type switch power-supply circuit according to claim 5, which is characterized in that
The start-up circuit (5) includes：4th resistance R4, the first capacitance C1 and the second capacitance C2；
One end of the 4th resistance R4 is connected with the input circuit (11), the other end and the first capacitance C1, described
Second capacitance C2 is connected with the pwm control circuit (2)；
The other end of the first capacitance C1 and the second capacitance C2 are grounded.
7. inverse-excitation type switch power-supply circuit according to claim 6, which is characterized in that
The pwm control circuit (2) includes：Preferred circuit (21), feedback circuit (22) and pwm chip (23)；
The input terminal of the preferred circuit (21) is connected with the output end of the output circuit (13), the preferred circuit (21)
Output end be connected with the input terminal of the input terminal of the output circuit (13) and the feedback circuit (22)；The standard
Circuit (21) is used to stablize the voltage of the output circuit (13), and the voltage value of the output circuit (13) is sent to described
Feedback circuit (22)；
The output end of the feedback circuit (22) is connected with the input terminal of the pwm chip (23)；The feedback circuit
(22) it is used to the voltage value of the output circuit (13) feeding back to the pwm chip (23).
8. inverse-excitation type switch power-supply circuit according to claim 7, which is characterized in that
The preferred circuit (21) includes：Reference voltage source U1, the 5th resistance R5 and the 6th resistance R6；
The first pin of the reference voltage source U1 is connected with the feedback circuit (22), second pin and the 6th resistance
R6 is connected with ground wire, and third pin is connected with the other end of the 6th resistance R6 and the 5th resistance R5；
The other end of the 5th resistance R5 is connected with the output circuit (13).
9. inverse-excitation type switch power-supply circuit according to claim 8, which is characterized in that
The input circuit (11) includes ripple filter circuit, and the ripple filter circuit includes：The electricity of third capacitance C3 and the 7th
Hinder R7；
One end of the third capacitance C3 is connected with fire line terminal, and the other end is connected with zero terminal；7th resistance
R7 is in parallel with the third capacitance C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721881633.3U CN207638553U (en) | 2017-12-28 | 2017-12-28 | A kind of inverse-excitation type switch power-supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721881633.3U CN207638553U (en) | 2017-12-28 | 2017-12-28 | A kind of inverse-excitation type switch power-supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207638553U true CN207638553U (en) | 2018-07-20 |
Family
ID=62851188
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|---|---|---|---|
| CN201721881633.3U Active CN207638553U (en) | 2017-12-28 | 2017-12-28 | A kind of inverse-excitation type switch power-supply circuit |
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| Country | Link |
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| CN (1) | CN207638553U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888066A (en) * | 2017-12-28 | 2018-04-06 | 浙江正泰仪器仪表有限责任公司 | A kind of inverse-excitation type switch power-supply circuit |
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2017
- 2017-12-28 CN CN201721881633.3U patent/CN207638553U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888066A (en) * | 2017-12-28 | 2018-04-06 | 浙江正泰仪器仪表有限责任公司 | A kind of inverse-excitation type switch power-supply circuit |
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Address after: Zhengtai Instrument Measurement Industrial Park, No.1 Liangce Road, Beibaixiang Town, Leqing City, Wenzhou City, Zhejiang Province, 325603 Patentee after: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. Country or region after: Zhong Guo Address before: 325603 Wenzhou Daqiao Industrial Park, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. Country or region before: Zhong Guo |
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