CN207251462U - Switching power circuit and electric power system - Google Patents

Switching power circuit and electric power system Download PDF

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Publication number
CN207251462U
CN207251462U CN201721169117.8U CN201721169117U CN207251462U CN 207251462 U CN207251462 U CN 207251462U CN 201721169117 U CN201721169117 U CN 201721169117U CN 207251462 U CN207251462 U CN 207251462U
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circuit
current
switch
limiting resistance
connecting pin
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温益军
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
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Abstract

The utility model discloses a kind of switching power circuit, including first control circuit, second control circuit, first switch circuit, second switch circuit and power supply ground capacity；A kind of electric power system, including voltage changing module, switching power circuit and operational module.Solve the problems, such as that component of the switching power circuit in on-off circuit in the case of there is start surge and short circuit is flimsy, improve the start impact resistance ability and short-circuit protection impact resistance ability of switching power circuit, while improve the stability of electric power system.

Description

Switching power circuit and electric power system
Technical field
It the utility model is related to field of switch power, and in particular to a kind of switching power circuit and electric power system.
Background technology
As shown in Figure 1, it is a kind of partial structural diagram of switching power circuit of the prior art.Its structure includes control Circuit, on-off circuit and the high-frequency isolation transformer that power supply is provided processed；The power input of control circuit and on-off circuit with The power output end connection of high-frequency isolation transformer；The signal output part of control circuit and the signal input part of on-off circuit connect Connect.On-off circuit includes P-channel MOS switch pipe and polarized capacitance E；When the signal of starting-up signal input control circuit inputs During end, the signal output part output signal of control circuit causes the P-channel MOS switch pipe of on-off circuit to turn on.Polarized capacitance E Wherein one end and the voltage output end of on-off circuit connect, the other end of polarized capacitance E ground connection, so that it is slow to provide start Punching so that the electric current in start process in whole on-off circuit is unlikely to excessive.
If there is the situation of the voltage output end shorted to earth of on-off circuit, P-channel MOS is flowed through in on-off circuit at this time The electric current of switching tube increases suddenly, so as to cause P-channel MOS switch pipe to be damaged；If the situation for start surge occur is what is started shooting There is no voltage in moment polarized capacitance E, the voltage output end shorted to earth of on-off circuit passes through P-channel MOS switch pipe Electric current increase suddenly, also result in the damage of P-channel MOS switch pipe.
The switching power circuit of the prior art is easy in the case where there is start surge and short circuit as can be seen here Cause the component damage in on-off circuit.I.e. the switching power circuit of the prior art does not possess the resistance to ability of punching of start and short circuit is protected Protect impact resistance ability.
Utility model content
The purpose of this utility model is to provide a kind of switching power circuit and electric power system, solves switching power circuit and exists The flimsy problem of component pipe in the case of appearance start surge and short circuit in on-off circuit, improves switch power supply The start impact resistance ability and short-circuit protection impact resistance ability on road.
To solve above technical problem, the utility model embodiment provides a kind of switching power circuit, including the first control Circuit, second control circuit, first switch circuit, second switch circuit and power supply ground capacity；Wherein,
The first switch circuit has switch control terminal, power input and power output end；The second switch electricity Road has switch control terminal, power input and power output end；The first control circuit, which has, to be used to receive starting-up signal Starting-up signal input terminal, power input and signal output part；The second control circuit, which has, to be used to detect described second Voltage detecting end, power input and the signal output part of the voltage signal of on-off circuit；
The power output end of the first switch circuit is connected with the first end of the power supply ground capacity, and the power supply connects The second end ground connection of ground capacitance；
The power input of the first switch circuit is connected with the power input of the second switch circuit, and described The power output end of one on-off circuit is connected with the power output end of the second switch circuit；
The switch control terminal of the first switch circuit is connected with the signal output part of the first control circuit, and described The switch control terminal of two on-off circuits is connected with the signal output part of the second control circuit；The electricity of the second control circuit Pressure test side is connected with the power output end of the first switch circuit.
Further, the first switch circuit includes：First switch pipe, the first current-limiting resistance, the second current-limiting resistance；
First connecting pin of the first switch pipe is connected with the switch control terminal of the first switch circuit, and described first The second connection end of switching tube is connected by first current-limiting resistance with the power input of the first switch circuit, described 3rd connecting pin of first switch pipe is connected with the power output end of the first switch circuit, and the of second current-limiting resistance One end is connected with the first connecting pin of the first switch pipe, the second end of second current-limiting resistance and the first switch pipe The 3rd connecting pin connection.
Further, the second switch circuit includes：Second switch pipe, the 3rd current-limiting resistance；
First connecting pin of the second switch pipe is connected with the switch control terminal of the second switch circuit, and described second The second connection end of switching tube is connected with the power input of the second switch circuit, the 3rd connection of the second switch pipe End is connected with the power output end of the second switch circuit, first end and the second switch pipe of the 3rd current-limiting resistance The connection of the first connecting pin, the second end of the 3rd current-limiting resistance is connected with the 3rd connecting pin of the second switch pipe.
Preferably, the first current-limiting resistance described in the first switch circuit is current limliting thermistor.
Further, the first control circuit includes：3rd switching tube and the 4th switching tube；
First connecting pin of the 3rd switching tube is connected with the starting-up signal input terminal of the first control circuit, described The second connection end ground connection of 3rd switching tube, the 3rd connecting pin of the 3rd switching tube connects with the first of the 4th switching tube End connection is connect, the second connection end of the 4th switching tube is connected with the power input of the first control circuit, and described the 3rd connecting pin of four switching tubes is connected with the signal output part of the first control circuit.
Preferably, the first control circuit further include the 4th current-limiting resistance, the 5th current-limiting resistance, the 6th current-limiting resistance and First capacitance；
The first end of 4th current-limiting resistance is connected with the starting-up signal input terminal of the first control circuit, and described The second end of four current-limiting resistances is connected with the first end of the 5th current-limiting resistance, the first end of the 5th current-limiting resistance and institute The first end connection of the first capacitance is stated, the second end of the 5th current-limiting resistance is connected with the second end of first capacitance, institute The first end for stating the first capacitance is connected with the first connecting pin of the 3rd switching tube, the second end of first capacitance with it is described The second connection end connection of 3rd switching tube, the first end of the 6th current-limiting resistance are connected with the 3rd of the 3rd switching tube End connection, the second end of the 6th current-limiting resistance are connected with the first connecting pin of the 4th switching tube.
Further, the second control circuit includes：Zener diode, the 5th switching tube, the 6th switching tube；
The anode of the zener diode is connected with the voltage detecting end of the second control circuit, the zener diode Cathode be connected with the first connecting pin of the 5th switching tube, the second connection end of the 5th switching tube ground connection, described the 3rd connecting pin of five switching tubes is connected with the first connecting pin of the 6th switching tube, the second connection of the 6th switching tube End is connected with the power input of the second control circuit, the 3rd connecting pin of the 6th switching tube and the described second control The signal output part connection of circuit.
Preferably, the second control circuit further include the 7th current-limiting resistance, the 8th current-limiting resistance, the 9th current-limiting resistance, Tenth current-limiting resistance and the second capacitance；
The first end of 7th current-limiting resistance is connected with the cathode of the zener diode, the 7th current-limiting resistance Second end is connected with the first end of the 8th current-limiting resistance, first end and second capacitance of the 8th current-limiting resistance First end connects, and the second end of the 8th current-limiting resistance is connected with the second end of second capacitance, second capacitance First end is connected with the first connecting pin of the 5th switching tube, the second end of second capacitance and the 5th switching tube Second connection end connects, and the first end of the 9th current-limiting resistance is connected with the 3rd connecting pin of the 5th switching tube, described The second end of 9th current-limiting resistance is connected with the first connecting pin of the 6th switching tube, the first end of the tenth current-limiting resistance It is connected with the 3rd connecting pin of the 6th switching tube, second end and the second control circuit of the tenth current-limiting resistance Signal output part connects.
Preferably, the switching power circuit further includes fly-wheel diode；The then signal output of the first control circuit End is connected with the cathode of the fly-wheel diode, the power input of the anode of the fly-wheel diode and the second control circuit End connection.
The utility model embodiment also provides a kind of electric power system, including：Voltage changing module, switching power circuit and Working mould Block；Wherein,
The voltage changing module has the first power output end and second source output terminal；The operational module is defeated with power supply Enter end；
First power output end of the voltage changing module is connected with the power input of the first switch circuit, the change The second source output terminal of die block is connected with the power input of the first control circuit, and the power supply of the operational module is defeated Enter end to be connected with the power output end of the first switch circuit.
Compared with the prior art, a kind of switching power circuit of the utility model and the beneficial effect of electric power system are： By setting second switch circuit and second control circuit, and the voltage detecting end connection first switch circuit of second control circuit Power output end；Specifically, when the voltage of the power output end of on-off circuit raises and more than a threshold value, the second control Circuit control second switch circuit turn-on acts the high current shared and produced suddenly due to surge in first switch circuit, so as to protect Component in shield first switch circuit is not damaged；When the voltage of the power output end of on-off circuit is reduced to a certain limit value When, second control circuit control second switch circuit has been closed protects the component of second switch circuit will not in a short-circuit situation Damaged because of short circuit overload.By between first control circuit, second control circuit, first switch circuit and second switch circuit Mutual cooperation, solve component of the switching power circuit in the case where there is start surge and short circuit in on-off circuit Flimsy problem is managed, the start impact resistance ability and short-circuit protection impact resistance ability of switching power circuit is improved, improves at the same time Electric power system stability.
Brief description of the drawings
Fig. 1 is a kind of partial structural diagram of switching power circuit of the prior art；
Fig. 2 is the structure diagram of one embodiment of switching power circuit provided by the utility model；
Fig. 3 is the circuit diagram of another embodiment of switching power circuit provided by the utility model；
Fig. 4 is the structure diagram of electric power system provided by the utility model.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without creative efforts All other embodiments obtained, shall fall within the protection scope of the present invention.
It is the structure diagram of one embodiment of switching power circuit provided by the utility model referring to Fig. 2, the switch Power circuit includes：First control circuit 30, second control circuit 40, first switch circuit 10, second switch circuit 20 and confession Electrically grounded capacitance；Wherein,
The first switch circuit 10 has switch control terminal, power input and power output end；The second switch 20 circuits have switch control terminal, power input and power output end；The first control circuit 30 has to be opened for reception Starting-up signal input terminal, power input and the signal output part of machine signal；The second control circuit 40, which has, to be used to detect Voltage detecting end, power input and the signal output part of the voltage signal of the second switch circuit；
The power output end of the first switch circuit 10 is connected with the first end of the power supply ground capacity, the power supply The second end ground connection of ground capacity；
The power input of the first switch circuit 10 is connected with the power input of the second switch circuit 20, institute The power output end for stating first switch circuit 10 is connected with the power output end of the second switch circuit 20；
The switch control terminal of the first switch circuit 10 is connected with the signal output part of the first control circuit 30, institute The switch control terminal for stating second switch circuit 20 is connected with the signal output part of the second control circuit 40；Second control The voltage detecting end of circuit 40 is connected with the power output end of the first switch circuit 10.
It should be noted that a kind of switching power circuit provided by the utility model, by set second switch circuit and Second control circuit, and the power output end of the voltage detecting end connection first switch circuit of second control circuit；Specifically, when The voltage rise of the power output end of on-off circuit and during more than a threshold value, second control circuit control second switch circuit is led The high current shared and produced suddenly due to surge in first switch circuit is led to, so as to protect first device in first switch circuit Part is not damaged；When the voltage of the power output end of on-off circuit is reduced to a certain limit value, second control circuit control second On-off circuit has been closed protects the component of second switch circuit not damaged because of short circuit overload in a short-circuit situation.Pass through Mutual cooperation between one control circuit, second control circuit, first switch circuit and second switch circuit, solves Switching Power Supply Component pipe flimsy problem of the circuit in on-off circuit in the case of there is start surge and short circuit, improves switch The start impact resistance ability and short-circuit protection impact resistance ability of power circuit.
As shown in figure 3, it is the circuit diagram of another embodiment of switching power circuit provided by the utility model.
Switching power circuit provided in this embodiment further optimizes partial function electricity on the basis of above-described embodiment The structure on road, it is specific as follows：
Preferably, the power supply ground capacity is polarized capacitance E301.
Further, the first switch circuit 10 includes：First switch pipe, the first current-limiting resistance, the second current-limiting resistance R301；
First connecting pin of the first switch pipe is connected with the switch control terminal of the first switch circuit 10, and described The second connection end of one switching tube is connected by first current-limiting resistance with the power input of the first switch circuit 10, 3rd connecting pin of the first switch pipe is connected with the power output end of the first switch circuit 10, the second current limliting electricity Resistance R301 first end be connected with the first connecting pin of the first switch pipe, the second end of the second current-limiting resistance R301 and The 3rd connecting pin connection of the first switch pipe.
Preferably, the first switch pipe is N-channel MOS pipe Q301；The grid of the N-channel MOS pipe Q301 is described First connecting pin of first switch pipe, it is the first switch pipe to drain as the second connection end of the first switch pipe, source electrode The 3rd connecting pin.
Preferably, first current-limiting resistance described in the first switch circuit 10 is current limliting thermistor NTC300.
Further, the second switch circuit 20 includes：Second switch pipe, the 3rd current-limiting resistance R300；
First connecting pin of the second switch pipe is connected with the switch control terminal of the second switch circuit 20, and described The second connection end of two switching tubes is connected with the power input of the second switch circuit 20, and the 3rd of the second switch pipe the Connecting pin is connected with the power output end of the second switch circuit 20, the first end of the 3rd current-limiting resistance R300 with it is described The first connecting pin connection of second switch pipe, the second end of the 3rd current-limiting resistance R300 and the 3rd of the second switch pipe the Connecting pin connects.
Preferably, the second switch pipe is N-channel MOS pipe Q300；The grid of the N-channel MOS pipe Q300 is described First connecting pin of second switch pipe, it is the second switch pipe to drain as the second connection end of the second switch pipe, source electrode The 3rd connecting pin.
Further, the first control circuit 30 includes：3rd switching tube and the 4th switching tube；
First connecting pin of the 3rd switching tube is connected with the starting-up signal input terminal of the first control circuit 30, institute State the second connection end ground connection of the 3rd switching tube, the 3rd connecting pin of the 3rd switching tube and the first of the 4th switching tube Connecting pin connects, and the second connection end of the 4th switching tube is connected with the power input of the first control circuit 30, institute The 3rd connecting pin for stating the 4th switching tube is connected with the signal output part of the first control circuit 30.
Preferably, the 3rd switching tube is NPN type triode Q304；4th switching tube is PNP type triode Q302；The base stage of the NPN type triode Q304 be the 3rd switching tube the first connecting pin, the NPN type triode The second connection end of extremely described 3rd switching tube of transmitting of Q304, the current collection of the NPN type triode Q304 extremely described the 3rd connecting pin of three switching tubes；The base stage of the PNP type triode Q302 be the 4th switching tube the first connecting pin, institute State the second connection end of extremely described 4th switching tube of transmitting of PNP type triode Q302, the collection of the PNP type triode Q302 Electrode is the 3rd connecting pin of the 4th switching tube.
Preferably, the first control circuit 30 further includes the 4th current-limiting resistance R306, the 5th current-limiting resistance R308, the 6th Current-limiting resistance R304 and the first capacitance C300；
The first end of the 4th current-limiting resistance R306 is connected with the starting-up signal input terminal of the first control circuit 30, The second end of the 4th current-limiting resistance R306 is connected with the first end of the 5th current-limiting resistance R308, the 5th current limliting electricity The first end of resistance R308 is connected with the first end of the first capacitance C300, the second end of the 5th current-limiting resistance R308 and institute The second end connection of the first capacitance C300 is stated, the first end of the first capacitance C300 is connected with the first of the 3rd switching tube End connection, the second end of the first capacitance C300 are connected with the second connection end of the 3rd switching tube, the 6th current limliting The first end of resistance R304 is connected with the 3rd connecting pin of the 3rd switching tube, the second end of the 6th current-limiting resistance R304 It is connected with the first connecting pin of the 4th switching tube.
Further, the second control circuit 40 includes：Zener diode ZD304, the 5th switching tube, the 6th switch Pipe；
The anode of the zener diode ZD304 is connected with the voltage detecting end of the second control circuit 40, described steady The cathode of pressure diode ZD304 is connected with the first connecting pin of the 5th switching tube, the second connection of the 5th switching tube End ground connection, the 3rd connecting pin of the 5th switching tube are connected with the first connecting pin of the 6th switching tube, and the described 6th opens The second connection end for closing pipe is connected with the power input of the second control circuit 40, the 3rd connection of the 6th switching tube End is connected with the signal output part of the second control circuit 40.
Preferably, the 5th switching tube is NPN type triode Q305；6th switching tube is PNP type triode Q303；The base stage of the NPN type triode Q305 be the 5th switching tube the first connecting pin, the NPN type triode The second connection end of extremely described 5th switching tube of transmitting of Q305, the current collection of the NPN type triode Q305 extremely described the 3rd connecting pin of five switching tubes；The base stage of the PNP type triode Q303 be the 6th switching tube the first connecting pin, institute State the second connection end of extremely described 6th switching tube of transmitting of PNP type triode Q303, the collection of the PNP type triode Q303 Electrode is the 3rd connecting pin of the 6th switching tube.
Preferably, the second control circuit further includes the 7th current-limiting resistance R307, the 8th current-limiting resistance R309, the 9th limit Leakage resistance R305, the tenth current-limiting resistance R303 and the second capacitance C301；
The first end of the 7th current-limiting resistance R307 is connected with the cathode of the zener diode ZD304, and the described 7th The second end of current-limiting resistance R307 is connected with the first end of the 8th current-limiting resistance R309, the 8th current-limiting resistance R309's First end is connected with the first end of the second capacitance C301, the second end of the 8th current-limiting resistance R309 and the described second electricity Hold the second end connection of C301, the first end of the second capacitance C301 is connected with the first connecting pin of the 5th switching tube, The second end of the second capacitance C301 is connected with the second connection end of the 5th switching tube, the 9th current-limiting resistance R305 First end be connected with the 3rd connecting pin of the 5th switching tube, the second end of the 9th current-limiting resistance R305 and described the The first connecting pin connection of six switching tubes, the first end of the tenth current-limiting resistance R303 connect with the 3rd of the 6th switching tube the End connection is connect, the second end of the tenth current-limiting resistance R303 is connected with the signal output part of the second control circuit 40.
Preferably, the switching power circuit further includes sustained diode 303 and current-limiting resistance R302；Then described first The signal output part of control circuit 30 is connected with the cathode of the sustained diode 303, the anode of the sustained diode 303 It is connected with the power input of the second control circuit 40；The then signal output part of the first control circuit 30 and the limit The first end connection of leakage resistance R302, the second end of current-limiting resistance R302 and the switch control terminal of the first switch circuit 10 connect Connect.
When PS-ON starting-up signal high level is inputted to the starting-up signal input terminal of the first control circuit 30 so that NPN type triode Q304 is turned on, so that PNP type triode Q302 is also switched on, by from the electricity of the first control circuit 30 The power supply signal of source input terminal input is provided to the signal output part of the first control circuit 30；Due in the first switch The switch control terminal of circuit 10 receives high level signal so that N-channel MOS pipe Q301 is turned on, will be from first switch electricity The power supply signal of the power input input on road 10 is delivered to the power output end of the first switch circuit 10, due to described the N-channel MOS pipe Q301 in one on-off circuit 10 connects with current limliting thermistor NTC300, flows through N-channel when start The dash current of metal-oxide-semiconductor Q301 will not be excessive.
When starting-up signal inputs the first control circuit 30 and the first switch circuit 10 and works normally, when described the The voltage detecting end of two controlling switches 40 detects that the output voltage of the power output end of the first switch circuit 10 is increased to During some voltage, if limit value is 20V, the zener diode ZD304 conductings in the second control circuit 40 so that NPN type Triode Q305 is turned on, so that PNP type triode Q303 is also switched on, by from the power input of the second control circuit 40 The power supply signal of end input is provided to the signal output part of the second control circuit 40；Due in the second switch circuit 20 Switch control terminal receive high level signal so that N-channel MOS pipe Q300 is turned on, and the electric conduction of N-channel MOS pipe Q300 Series resistance of the resistance much smaller than N-channel MOS pipe Q301 and current limliting thermistor NTC300, carries out the first switch circuit 10 Overvoltage protection；Electric current when the power output end normal work of the first switch circuit all flows through N-channel MOS pipe substantially Without flow through electric current on Q300, N-channel MOS pipe Q301 so that the N-channel MOS of the first switch circuit 10 when starting shooting surge Pipe Q301 is protected, and improves the start impact resistance ability of switching power circuit.
When circuit works normally, it is the first switch that short circuit, which occurs, for the power output end of the first switch circuit 10 The power output end ground connection of circuit 10, when the voltage detecting end of second controlling switch 40 detects the first switch circuit When the output voltage of 10 power output end drops to some voltage, if limit value is 20V, in the second control circuit 40 NPN type triode Q305 is turned off, so that PNP type triode Q303 is also turned off, the second switch circuit 20 is opened Close control terminal and receive low level so that N-channel MOS pipe Q300 is turned off, do not have high current and flow through N-channel MOS pipe Q300； The short circuit current flow of overcurrent flows through the N-channel MOS pipe Q301 and current limliting thermistor NTC300 of the first switch circuit 10 at this time, Since the effect of current limliting thermistor NTC300 current limitings, the short circuit current flow of overcurrent are not too large so that in short circuit when institute The N-channel MOS pipe Q300 for stating second switch circuit 20 is protected, and improves the short-circuit protection impact resistance energy of switching power circuit Power.
As described in Figure 4, the utility model embodiment also provides a kind of electric power system, including：Voltage changing module 401, switch electricity Source circuit 402 and operational module 403；Wherein,
The voltage changing module 401 has the first power output end and second source output terminal；The operational module tool 403 has Power input；
First power output end of the voltage changing module 401 is connected with the power input of the first switch circuit 10, The second source output terminal of the voltage changing module 401 is connected with the power input of the first control circuit 30, the work The power input of module 403 is connected with the power output end of the first switch circuit 10.
As shown in Figure 3, it is preferable that the voltage changing module 401 is used for the high frequency transformation of AC-DC converter for TV power supplys Device；The operational module is the electronic devices such as backlight.
In conclusion a kind of switching power circuit of the utility model and the beneficial effect of electric power system are：By setting Put second switch circuit and second control circuit, and the power supply of the voltage detecting end connection first switch circuit of second control circuit Output terminal；Specifically, when the voltage of the power output end of on-off circuit raises and more than a threshold value, second control circuit control Second switch circuit turn-on processed acts the high current shared and produced suddenly due to surge in first switch circuit, so as to protect first Component in on-off circuit is not damaged；When the voltage of the power output end of on-off circuit is reduced to a certain limit value, second Control circuit control second switch circuit has been closed protects the component of second switch circuit will not be because of short circuit in a short-circuit situation Overload and damage.By mutual between first control circuit, second control circuit, first switch circuit and second switch circuit Coordinate, solve component pipe rapid wear of the switching power circuit in on-off circuit in the case of there is start surge and short circuit Bad the problem of, the start impact resistance ability and short-circuit protection impact resistance ability of switching power circuit are improved, while improve power supply System stability.
The above is the preferred embodiment of the utility model, it is noted that for the ordinary skill of the art For personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these are improved and profit Decorations are also considered as the scope of protection of the utility model.

Claims (10)

  1. A kind of 1. switching power circuit, it is characterised in that including first control circuit, second control circuit, first switch circuit, Second switch circuit and power supply ground capacity；Wherein,
    The first switch circuit has switch control terminal, power input and power output end；The second switch circuit tool There are switch control terminal, power input and power output end；The first control circuit, which has, to be used to receive opening for starting-up signal Machine signal input part, power input and signal output part；The second control circuit, which has, to be used to detect the second switch Voltage detecting end, power input and the signal output part of the voltage signal of circuit；
    The power output end of the first switch circuit is connected with the first end of the power supply ground capacity, described for electrical ground electricity The second end ground connection of appearance；
    The power input of the first switch circuit is connected with the power input of the second switch circuit, and described first opens The power output end on powered-down road is connected with the power output end of the second switch circuit；
    The switch control terminal of the first switch circuit is connected with the signal output part of the first control circuit, and described second opens The switch control terminal on powered-down road is connected with the signal output part of the second control circuit；The voltage inspection of the second control circuit End is surveyed to be connected with the power output end of the first switch circuit.
  2. 2. switching power circuit as claimed in claim 1, it is characterised in that the first switch circuit includes：First switch Pipe, the first current-limiting resistance, the second current-limiting resistance；
    First connecting pin of the first switch pipe is connected with the switch control terminal of the first switch circuit, the first switch The second connection end of pipe is connected by first current-limiting resistance with the power input of the first switch circuit, and described first 3rd connecting pin of switching tube is connected with the power output end of the first switch circuit, the first end of second current-limiting resistance It is connected with the first connecting pin of the first switch pipe, the of the second end of second current-limiting resistance and the first switch pipe Three connecting pins connect.
  3. 3. switching power circuit as claimed in claim 1, it is characterised in that the second switch circuit includes：Second switch Pipe, the 3rd current-limiting resistance；
    First connecting pin of the second switch pipe is connected with the switch control terminal of the second switch circuit, the second switch The second connection end of pipe is connected with the power input of the second switch circuit, the 3rd connecting pin of the second switch pipe with The power output end connection of the second switch circuit, the of the first end of the 3rd current-limiting resistance and the second switch pipe One connecting pin connects, and the second end of the 3rd current-limiting resistance is connected with the 3rd connecting pin of the second switch pipe.
  4. 4. switching power circuit as claimed in claim 2, it is characterised in that first current-limiting resistance is current limliting temperature-sensitive electricity Resistance.
  5. 5. switching power circuit as claimed in claim 1, it is characterised in that the first control circuit includes：3rd switch Pipe and the 4th switching tube；
    First connecting pin of the 3rd switching tube is connected with the starting-up signal input terminal of the first control circuit, and the described 3rd The second connection end ground connection of switching tube, the 3rd connecting pin of the 3rd switching tube and the first connecting pin of the 4th switching tube Connection, the second connection end of the 4th switching tube are connected with the power input of the first control circuit, and the described 4th opens The 3rd connecting pin for closing pipe is connected with the signal output part of the first control circuit.
  6. 6. switching power circuit as claimed in claim 5, it is characterised in that the first control circuit further includes the 4th current limliting Resistance, the 5th current-limiting resistance, the 6th current-limiting resistance and the first capacitance；
    The first end of 4th current-limiting resistance is connected with the starting-up signal input terminal of the first control circuit, the 4th limit The second end of leakage resistance is connected with the first end of the 5th current-limiting resistance, the first end of the 5th current-limiting resistance and described the The first end connection of one capacitance, the second end of the 5th current-limiting resistance is connected with the second end of first capacitance, and described the The first end of one capacitance is connected with the first connecting pin of the 3rd switching tube, the second end of first capacitance and the described 3rd The second connection end connection of switching tube, the first end of the 6th current-limiting resistance connect with the 3rd connecting pin of the 3rd switching tube Connect, the second end of the 6th current-limiting resistance is connected with the first connecting pin of the 4th switching tube.
  7. 7. switching power circuit as claimed in claim 1, it is characterised in that the second control circuit includes：Two pole of voltage stabilizing Pipe, the 5th switching tube, the 6th switching tube；
    The anode of the zener diode is connected with the voltage detecting end of the second control circuit, and the zener diode is just Pole is connected with the first connecting pin of the 5th switching tube, and the second connection end ground connection of the 5th switching tube, the described 5th opens Close pipe the 3rd connecting pin be connected with the first connecting pin of the 6th switching tube, the second connection end of the 6th switching tube and The power input connection of the second control circuit, the 3rd connecting pin and the second control circuit of the 6th switching tube Signal output part connection.
  8. 8. switching power circuit as claimed in claim 7, it is characterised in that the second control circuit further includes the 7th current limliting Resistance, the 8th current-limiting resistance, the 9th current-limiting resistance, the tenth current-limiting resistance and the second capacitance；
    The first end of 7th current-limiting resistance is connected with the cathode of the zener diode, and the second of the 7th current-limiting resistance End is connected with the first end of the 8th current-limiting resistance, the first end of the 8th current-limiting resistance and the first of second capacitance End connection, the second end of the 8th current-limiting resistance are connected with the second end of second capacitance, and the first of second capacitance End is connected with the first connecting pin of the 5th switching tube, the second end of second capacitance and the second of the 5th switching tube Connecting pin connects, and the first end of the 9th current-limiting resistance is connected with the 3rd connecting pin of the 5th switching tube, and the described 9th The second end of current-limiting resistance is connected with the first connecting pin of the 6th switching tube, the first end of the tenth current-limiting resistance and institute State the 3rd connecting pin connection of the 6th switching tube, the second end of the tenth current-limiting resistance and the signal of the second control circuit Output terminal connects.
  9. 9. switching power circuit as claimed in claim 1, it is characterised in that further include fly-wheel diode；
    Then the signal output part of the first control circuit is connected with the cathode of the fly-wheel diode, the fly-wheel diode Anode is connected with the power input of the second control circuit.
  10. 10. a kind of electric power system, it is characterised in that including voltage changing module, switching power circuit and operational module；Wherein,
    The switching power circuit is claim 1 to 9 any one of them switching power circuit；
    The voltage changing module has the first power output end and second source output terminal；The operational module has power input End；
    First power output end of the voltage changing module is connected with the power input of the first switch circuit, the change pressing mold The second source output terminal of block is connected with the power input of the first control circuit, the power input of the operational module It is connected with the power output end of the first switch circuit.
CN201721169117.8U 2017-09-12 2017-09-12 Switching power circuit and electric power system Active CN207251462U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721169117.8U CN207251462U (en) 2017-09-12 2017-09-12 Switching power circuit and electric power system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721169117.8U CN207251462U (en) 2017-09-12 2017-09-12 Switching power circuit and electric power system

Publications (1)

Publication Number Publication Date
CN207251462U true CN207251462U (en) 2018-04-17

Family

ID=61888335

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721169117.8U Active CN207251462U (en) 2017-09-12 2017-09-12 Switching power circuit and electric power system

Country Status (1)

Country Link
CN (1) CN207251462U (en)

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