CN206517295U - A kind of on-off circuit - Google Patents
A kind of on-off circuit Download PDFInfo
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- CN206517295U CN206517295U CN201621402987.0U CN201621402987U CN206517295U CN 206517295 U CN206517295 U CN 206517295U CN 201621402987 U CN201621402987 U CN 201621402987U CN 206517295 U CN206517295 U CN 206517295U
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Abstract
The utility model discloses a kind of on-off circuit, the connected mode of the body diode by setting synchro switch pipe, so as to change the sensing of the body diode of synchro switch pipe, then by controlling the grid voltage of power switch pipe and synchro switch pipe, it is possible to achieve：One is on-off circuit in the course of work is started, and output voltage is begun to ramp up by zero, without inrush current, can avoid damaging device in circuit；Two be that in the course of normal operation of on-off circuit, output voltage can be controlled to be higher than input voltage, and output voltage can also be controlled to be less than input voltage；Three be that under circuit off-mode, input is blocked completely with output end, even if circuit malfunctions, it is possibility to have effect protection circuit, improves the efficiency and reliability of circuit.
Description
Technical field
The utility model is related to field of switch power, more specifically to a kind of on-off circuit.
Background technology
The schematic diagram of synchronous rectified boost circuit of the prior art is as shown in figure 1, the power stage electricity of the booster circuit
Road include inductance L1, power switch pipe M1 (by taking nmos switch pipe as an example) and synchro switch pipe M2 (by taking PMOS switch pipe as an example),
Input capacitance C1 and output capacitance C2, inductance L1 two ends are connected on DC input voitage VIN positive poles and nmos switch pipe M1's respectively
Drain electrode, nmos switch pipe M1 source ground, PMOS switch pipe M2 drain electrode connects nmos switch pipe M1 drain electrode, PMOS switch pipe
M2 source electrode connects output voltage VO UT positive poles, and output voltage VO UT negative pole is grounded, and switching tube M1, M2 pass through pwm signal control
On off state controls output voltage VO UT purpose to reach.
However, above-mentioned booster circuit has the following disadvantages：First, at the system electrification moment, input voltage VIN and output
Voltage VOUT pressure differences are than larger, and input voltage VIN is filled by inductance L1, PMOS switch pipe M2 body diode to output capacitance C2
Electricity, larger input voltage can form dash current, and damage is likely to result in circuit element, system reliability is reduced；Second,
Circuit can only control output voltage VO UT to be higher than input voltage VIN in the course of the work；3rd, when system stalls, by
In the presence of PMOS switch pipe M2 body diode so that the low-impedance path of input to output end can not be completely cut through.Such as
Fruit is broken down (such as output short-circuit), and electric current will be caused uncontrolled, threatens system safety.
Utility model content
In view of this, the utility model proposes a kind of on-off circuit, by the body diode for setting synchro switch pipe
Connected mode and the turning-on voltage for controlling synchro switch pipe, can solve asking for above-mentioned on-off circuit presence of the prior art
Topic.
According to on-off circuit of the present utility model, including inductance, power switch pipe and synchro switch pipe, the inductance connection
Between the input voltage of the on-off circuit and the points of common connection of the power switch pipe and synchro switch pipe,
The body diode of the synchro switch pipe includes the first diode and the second diode, the first diode and the two or two
The negative electrode connection of pole pipe, the anode of first diode connects the output end, the anode connection institute of second diode
The points of common connection of power switch pipe and synchro switch pipe is stated,
In the on-off circuit startup stage, when output voltage is less than input voltage, then by the synchro switch pipe
Body diode is hanging or controls the direction of the body diode of the synchro switch pipe to be to point to the power switch from output end
The points of common connection of pipe and synchro switch pipe, the control end of the power switch pipe receives pwm control signal, the synchro switch
The control end of pipe receives the input voltage signal；
When output voltage, which is equal to, is more than input voltage, then by the body diode of the synchro switch pipe is hanging or control
The direction of the body diode of the synchro switch pipe is to be pointed to from the points of common connection of the power switch pipe and synchro switch pipe
The control end of output end, the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
Further, in the on-off circuit course of normal operation,
Such as need control output voltage to be less than input voltage, then control the body diode of the synchro switch pipe hanging or control
The direction for making the body diode of the synchro switch pipe is the public affairs that the power switch pipe and synchro switch pipe are pointed to from output end
Common tie point, the control end of the power switch pipe receives pwm control signal, and the control end of the synchro switch pipe receives described
Input voltage signal；
Such as need control output voltage to be equal to when being more than input voltage, then by the body diode of the synchro switch pipe it is hanging or
The direction for being the body diode for controlling the synchro switch pipe is from the commonly connected of the power switch pipe and synchro switch pipe
The control end of point sensing output end, the control end of the power switch pipe and the synchro switch pipe receives the PWM controls
Signal.
Further, when the on-off circuit is stopped,
The control end of the power switch pipe is controlled to be grounded；
If output voltage is more than input voltage, the control end of the synchro switch pipe is controlled to receive output voltage signal,
And control the body diode of the synchro switch pipe hanging or control the direction of the body diode of the synchro switch pipe for from
The points of common connection of power switch pipe and the synchro switch pipe points to output end,
If output voltage is less than input voltage, the control end of the synchro switch pipe is controlled to receive input voltage signal,
And control the substrate of the synchro switch pipe hanging or control the direction of the body diode of the synchro switch pipe to be from output
Point to the points of common connection of the power switch pipe and synchro switch pipe in end.
Further, the on-off circuit further comprises first switch pipe, and the first switch pipe is connected in parallel on described
The two ends of one diode.
Further, the on-off circuit further comprises second switch pipe, and the second switch pipe is connected in parallel on described
The two ends of two diodes.
Further, the on-off circuit further comprises the 3rd switching tube and the 4th switching tube, the 3rd switching tube
The two ends of first diode are connected in parallel on, the 4th paralleled power switches are at the two ends of second diode.
In summary, the control method and on-off circuit according to a kind of on-off circuit of the present utility model, it is same by setting
The connected mode of the body diode of switching tube is walked, so as to change the sensing of the body diode of synchro switch pipe, then passes through control
The grid voltage of power switch pipe and synchro switch pipe, it is possible to achieve：One is on-off circuit in the course of work is started, output electricity
Pressure is begun to ramp up by zero, without inrush current, can avoid damaging device in circuit；Two be the normal work in on-off circuit
During work, output voltage can be controlled to be higher than input voltage, output voltage can also be controlled to be less than input voltage；Three be in electricity
Under the off-mode of road, input is blocked completely with output end, even if circuit malfunctions, it is possibility to have effect protection circuit, is improved
The efficiency and reliability of circuit.
Scheme explanation
Fig. 1 show the schematic diagram of the on-off circuit of synchronous rectification of the prior art；
Fig. 2 a show on-off circuit the first implementation of reduction dash current of the prior art；
Fig. 2 b show second of implementation of on-off circuit of reduction dash current of the prior art；
Fig. 2 c show on-off circuit the third implementation of reduction dash current of the prior art；
On-off circuit the first implementation that Fig. 3 a show that input and output of the prior art block；
Fig. 3 b show second of implementation of on-off circuit that input and output of the prior art are blocked；
Fig. 4 a show the first implementation according to on-off circuit of the present utility model；
Fig. 4 b show second of implementation according to on-off circuit of the present utility model；
Fig. 4 c show the third implementation according to on-off circuit of the present utility model；
Fig. 4 d show the 4th kind of implementation according to on-off circuit of the present utility model；
Fig. 5 a are shown according to the first circuit controling drawing in the on-off circuit course of work of the present utility model；
Fig. 5 b are shown according to second of circuit controling drawing in the on-off circuit course of work of the present utility model；
Fig. 6 show the shutdown fundamental diagram according to on-off circuit of the present utility model；
Fig. 7 a show the flow chart of the control method of the start-up course according to on-off circuit of the present utility model；
Fig. 7 b show the flow chart of the control method of the shutdown process according to on-off circuit of the present utility model.
Embodiment
Some preferred embodiments of the present utility model are described in detail below with reference to accompanying drawing, but the utility model is not limited to
This.
Just as known from prior art, the problem of due to there is inrush current in traditional booster circuit, in order to reduce
Inrush current causes damage to circuit element, there is following several solutions in the prior art：
1)：In input VIN and output end VOUT the connection bypass diode D1 of booster circuit, as shown in Figure 2 a, input
When electric on voltage VIN, dash current can largely be charged by bypass diode D1 to output capacitance C2, so as to reduce to master
The damage of component in circuit.
2)：System start the period increase current-limiting resistance, as shown in Figure 2 b, current-limiting resistance R1 be connected on input VIN and
Between inductance L, delay switch MDELAYIt is in parallel with current-limiting resistance R1.Electric moment, delay switch M in input voltage VINDELAYIt is in
Off state, current-limiting resistance R1 is connected on main loop of power circuit, and input voltage VIN is filled by current-limiting resistance R1 to output capacitance C2
Electricity.It is delayed after a period of time, controls delay switch MDELAYConducting, current-limiting resistance R1 is short-circuited without working again, reduced with this
Damage to component in main circuit.
3)：Increase Current limited Control loop, as shown in Figure 2 c, in system start-up phase, electric current is detected with voltage detection unit
Synchronous rectifier M2 pressure drop and electric current, the mesh of control M1 electric currents is reached by loop control power switch pipe M1 grid voltages
's.When power switch pipe M1 pressure drops are larger, output capacitance C2 is charged with less constant current；With on output voltage
Rise, power switch pipe M1 pressure drops drop to after certain threshold value, larger output current are switched to, until output voltage VO UT exceedes
Input voltage VIN, then switch to normal boost operating mode.
But, in place of the equal Shortcomings of three kinds of above-mentioned modes：Between booster circuit input and output end by increase
The mode of road diode can not reduce inrush current, simply allow bypass diode to shunt most of dash current, therefore
Need selection rated current than larger diode, which results in the increase of system cost.By increasing current-limiting resistance and prolonging
The problem of similarly there is system cost increase in Shi Kaiguan mode, and after start-up course terminates, delay switch is gone here and there always
Main loop of power circuit is associated in, this will cause the loss in efficiency of system.The scheme of increase current-limiting control circuit can solve to start punching
Hit problem, but need to increase feedback control loop, system complex, and output can only band compared with light-load starting.
In order to solve traditional booster circuit in order to realize that output is blocked completely with input, prior art is generally using following
Several measures：
1) a switching tube M is concatenated in input VIN or output end VOUTSCP, as shown in Fig. 3 a or 3b in switching tube
MSCPIt is shown, it is stopped switching tube M then when needing control booster circuitSCPShut-off, due to MSCPBody diode and booster circuit
The body diode of synchro switch pipe is in opposite direction, therefore can realize that circuit input is complete switched off with output；
2) in circuit input or output end concatenation resettable fuse F1, when system jam makes to flow through self- recoverage guarantor
The increase heating of dangerous silk electric current cuts off fuse, plays a protective role, as shown in Fig. 3 a or 3b in shown in F1；
But, there is also deficiency for such scheme：Due to needing to increase extra switching tube or resettable fuse, system
Cost is higher；Either because switching tube or resettable fuse need to be connected on main work(always under circuit normal operating conditions
Rate loop, result in the less efficient of system；Additionally, due to resettable fuse be by fuel factor principle come protection circuit, because
This protects speed slow and is not easily achieved and accurately controls, and reduces the reliability of system.
Therefore, utility model people is on the basis of the studies above, it is proposed that a kind of on-off circuit, is illustrated in figure 4 foundation
The circuit diagram of the first embodiment of a kind of on-off circuit of the present utility model, as shown in figure 4, the on-off circuit includes inductance
L1, power switch pipe M1 (by taking nmos switch pipe as an example) and synchro switch pipe M2 (by taking PMOS switch pipe as an example), the inductance L1
It is connected to the DC input voitage VIN of on-off circuit positive pole and the power switch pipe M1 and synchro switch pipe M2 public affairs
The negative pole of tie point SW, the power switch pipe M1 another termination input voltage VIN altogether, the synchro switch pipe it is another
The output voltage VO UT of one termination on-off circuit positive pole, the negative pole ground connection of the output voltage VO UT.Input capacitance CIN
The two ends of the DC input voitage are connected in parallel on, output capacitance COUT is connected in parallel on the two ends of the output voltage.
As is shown in fig. 4 a, the body diode of the synchro switch pipe includes the first diode D1 and the second diode D2,
First diode D1 and the second diode D2 negative electrode connection, the anode of the first diode D1 connect the output end, institute
The anode for stating the second diode D2 connects the points of common connection SW of the power switch pipe and synchro switch pipe.The synchro switch
The body diode tie point of pipe is designated as B poles, in the present embodiment, and the B of the substrate of the synchro switch pipe is extremely hanging.
According to Fig. 4 a circuit structure, when the on-off circuit starts, output voltage VO UT is zero, output voltage VO UT
, now can be extremely hanging by the body diode B of the synchro switch pipe less than input voltage VIN, synchro switch pipe M2 control ends
I.e. grid G is connected to DC input voitage VIN, and power switch pipe M1 control end is that grid receives pwm control signal, such as Fig. 5 a institutes
The grid connected mode of power switch pipe and synchro switch pipe shown in showing.Power switch pipe M1 gate source voltage is led more than it
Be powered pressure, and when power switch pipe M1 is turned on, points of common connection SW voltage is pulled down to zero.Now, it is clear that output voltage VO UT
Less than DC input voitage VIN, therefore synchro switch pipe M2 grids current potential highest for source electrode and drain electrode, is synchronously opened
Pipe M2 shut-offs are closed, inductance L1 electric currents rise, power switch pipe M1 turns on certain time or when inductive current rises to setting base
On time, power switch pipe M1 is turned off；When power switch pipe M1 is turned off, because inductive current direction is from input to commonly connected
Point SW, therefore points of common connection SW voltage rise, make synchro switch pipe M2 grid source when points of common connection SW voltages rise to
Voltage VGSLess than its cut-in voltage VTHWhen, i.e. VGS<VTH, wherein VTHFor synchro switch pipe M2 cut-in voltage, synchro switch pipe
M2 is turned on, it is readily appreciated that, because synchro switch pipe M2 is PMOS switch pipe, so voltage VGSWith voltage VTHIt is negative voltage, so
Output voltage VO UT is begun to ramp up afterwards, and in order to maintain synchro switch pipe M2 conducting states, points of common connection SW voltages at least should
Cut-in voltage V is higher by than DC input voitage VIN voltageTHSize.And now because output voltage VO UT is still less than input
Voltage VIN, it can therefore be appreciated that synchro switch pipe M2 is operated in saturation state, synchro switch pipe M2 pressure drops are about VIN+VTH+
VDSAT-VOUT, wherein, VDSAT is synchro switch pipe M2 saturation voltage, and inductive current declines, set when inductive current drops to
When determining a reference value, then the M1 conductings of control power switch pipe repeat said process again.
Afterwards, when output voltage VO UT is risen to equal to or more than input voltage, synchro switch pipe M2 body diode
B it is extremely hanging, power switch pipe M1 and synchro switch pipe M2 control end receive the pwm control signal, power switch pipe
With the grid connected mode of synchro switch pipe as shown in Figure 5 b.Power switch pipe M1 and synchro switch pipe M2 alternating break-makes, circuit
Into conventional boost operating mode.
By above-mentioned startup mode of operation it is recognised that on-off circuit of the present utility model can make output electricity on startup
Pressure VOUT starts from scratch rising, and the electric current in start-up course is controlled, will not produce impact to circuit, will not damage electricity
Component in road.According to above-mentioned circuit structure, the utility model embodiment is by the way of PWM controls, without extra increasing
Plus feedback control loop, implement simple and reliable, and can realize that output end can be with starting with full load.
It is that the present embodiment is according to a kind of circuit diagram of the second embodiment of on-off circuit of the present utility model with reference to Fig. 4 b
First switch pipe S1, the first switch pipe S1 are added in Fig. 4 a embodiment and is connected in parallel on the two of the first diode D1
End.Similarly, during circuit start, output voltage VO UT is less than input voltage VIN, now controls first switch pipe S1 to break
Open；When output voltage VO UT is more than input voltage VIN, continue to control first switch pipe S1 to disconnect, embodiment shown in Fig. 4 b
Power switch pipe and synchro switch pipe control end connected mode and Fig. 4 a in be identical, in start-up course,
The course of work of the present embodiment and Fig. 4 a are also identical, be will not be repeated here.For Fig. 4 a, in the first diode D1
Two ends first switch pipe in parallel, system effectiveness can be improved, reduce the possibility that latch-up occurs.
It is that the present embodiment is according to a kind of circuit diagram of the 3rd embodiment of on-off circuit of the present utility model with reference to Fig. 4 c
Second switch pipe S2, the second switch pipe S2 are added in Fig. 4 a embodiment and is connected in parallel on the two of the second diode D2
End.Similarly, during circuit start, output voltage VO UT is less than input voltage VIN, now controls second switch pipe S2 to close
Close；When output voltage VO UT is more than input voltage VIN, control second switch pipe S2 disconnects, the work(of embodiment shown in Fig. 4 c
The connected mode of the control end of rate switching tube and synchro switch pipe is with being identical in Fig. 4 a, in start-up course, this reality
The course of work and Fig. 4 a for applying example are also identical, be will not be repeated here.
Fig. 4 d are that, according to a kind of circuit diagram of the fourth embodiment of on-off circuit of the present utility model, the present embodiment is in figure
The 3rd switching tube S3 and the 4th switching tube S4 is added in 4a embodiment, the 3rd switching tube S3 is connected in parallel on the described 1st
Pole pipe D1 two ends, the 4th switching tube S4 is connected in parallel on the two ends of the second diode D2.Similarly, in circuit start mistake
Cheng Zhong, output voltage VO UT are less than input voltage VIN, now control the 3rd switching tube S3 to disconnect, and the 4th switching tube S4 of control is closed
Close；When output voltage VO UT is more than input voltage VIN, control the 3rd switching tube S3 closures, the 4th switching tube S4 of control disconnects,
It is identical in the connected mode of the control end of the power switch pipe of embodiment and synchro switch pipe shown in Fig. 4 d and Fig. 4 a,
In start-up course, the course of work and Fig. 4 a of the present embodiment are also identical, be will not be repeated here.
Power switch pipe M1 and synchro switch pipe M2 control when Fig. 5 a show output voltage VO UT less than input voltage VIN
The control mode of the connected mode at end processed and synchro switch pipe M2 body diode, where the dotted line signifies that output voltage VO UT<
Synchro switch pipe M2 body diodes switching tube in parallel is optional during input voltage VIN；Fig. 5 b show output voltage VO UT
The connected mode of power switch pipe M1 and synchro switch pipe M2 control end and synchro switch pipe M2 during more than input voltage VIN
Body diode control mode, dotted line represents the synchro switch pipe M2 bodies in the case of output voltage VO UT >=input voltage VIN
The switching tube of diodes in parallel is optional.It is can be seen that according to Fig. 5 a and 5b embodiment when output voltage is less than input electricity
During pressure, the direction of the body diode of the synchro switch pipe is to point to the power switch pipe and synchro switch pipe from output end
Points of common connection；When output voltage, which is equal to, is more than input voltage, the direction of the body diode of the synchro switch pipe is from institute
The points of common connection for stating power switch pipe and synchro switch pipe points to output end.Opened by the utility model embodiment synchronous
Close the sensing control of the body diode of pipe, it is possible to achieve on-off circuit can make on output voltage VO UT starts from scratch on startup
Rise, and the electric current in start-up course is controlled, will not produce impact to circuit, the component that will not be damaged in circuit.
The above-mentioned course of work according to on-off circuit of the present utility model in start-up course, in the normal work of circuit
During, it need to such as control output voltage VO UT to be higher than input voltage VIN, then circuit is operated in traditional boost mode, such as Fig. 5 b
It is shown, it need to such as control output voltage VO UT to be less than input voltage VIN, then circuit operating pattern is similar to Fig. 5 a.Therefore this practicality
New on-off circuit can both make circuit be operated in the state that output voltage is higher than input voltage, can also be operated in circuit
Output voltage is less than the state of input voltage.
Finally, when on-off circuit needs to enter and is stopped state, then power switch pipe M1 control end is controlled first
That is grounded-grid, then, when shutdown moment output voltage VO UT is higher than input voltage VIN, then first by synchro switch pipe M2 grid
Pole is grounded, and inductive current is declined by synchro switch pipe M2 afterflows, inductive current, after inductive current drops to zero, now, such as
Fruit output voltage VO UT>DC input voitage VIN, then be connected to output voltage VO UT by synchro switch pipe M2 grid, synchronously open
The connected mode for closing pipe M2 body diode B poles is similar to Fig. 5 b；When inductive current drops to zero, if output voltage VO UT<
DC input voitage VIN, then be connected to input voltage VIN, synchro switch pipe M2 body diode B poles by synchro switch pipe M2 grid
Connection is similar to Fig. 5 a.
If at the shutdown moment, the output voltage VO UT of on-off circuit is less than input voltage VIN, then by synchro switch pipe M2
Grid meet DC input voitage VIN, synchro switch pipe M2 is operated in saturation state, after inductive current drops to zero, synchronously opened
Close pipe M2 shut-offs.
The shutdown operation principle of on-off circuit is as shown in fig. 6, wherein dotted portion represents above-mentioned output voltage VO UT<Input
The switch of synchro switch pipe M2 body diodes parallel connection in the case of voltage VIN and output voltage VO UT >=two kinds of input voltage VIN
Pipe be it is optional, MAX represent selection inductive current drop to zero after selection output voltage VO UT and DC input voitage VIN between
Higher value as synchro switch pipe M2 signal.From above-mentioned shutdown control circuit process description, if the shutdown moment
Inductive current direction from input to points of common connection SW, then inductive current will be by synchro switch pipe M2 to output voltage
VOUT afterflows, when inductive current drops to zero, synchro switch pipe M2 is complete switched off, and main circuit is stopped；If shutting down moment electricity
Inducing current direction is continued by points of common connection SW to input, then inductive current by power switch pipe M1 body diode
Stream, makes inductive current drop to zero, main circuit is stopped.Therefore according to the utility model on-off circuit control method and open
Powered-down road can make system in shutdown process, and inductive current has continuous current circuit all the time, and will not produce due to voltage spikes, main electricity
After road is stopped, its input is blocked completely with output end.Even if generation fault, such as output short-circuit or overload, due to
Circuit is inputted to be blocked completely with output, therefore system can obtain timely and effective protection, good reliability.
With reference to the control method that Fig. 7 a are the start-up course according to on-off circuit of the present utility model, including step：Institute
On-off circuit startup stage is stated, it is when output voltage is less than input voltage, then the body diode of the synchro switch pipe is hanging
Or it is to point to the power switch pipe and synchro switch from output end to control the direction of the body diode of the synchro switch pipe
The points of common connection of pipe, the control end of the power switch pipe receives pwm control signal, the control termination of the synchro switch pipe
Receive the input voltage signal；
When output voltage, which is equal to, is more than input voltage, then by the body diode of the synchro switch pipe is hanging or control
The direction of the body diode of the synchro switch pipe is to be pointed to from the points of common connection of the power switch pipe and synchro switch pipe
The control end of output end, the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
With reference to the control method that Fig. 7 b are the shutdown process according to on-off circuit of the present utility model, including step：Work as institute
When stating on-off circuit and being stopped,
The control end of the power switch pipe is controlled to be grounded；
As now output voltage more than input voltage, then controls the control end of the synchro switch pipe to receive output voltage letter
Number, and control the body diode of the synchro switch pipe hanging or control the direction of the body diode of the synchro switch pipe to be
Output end is pointed to from the points of common connection of the power switch pipe and synchro switch pipe,
As now output voltage less than input voltage, then controls the control end of the synchro switch pipe to receive input voltage letter
Number, and control the body diode of the synchro switch pipe hanging or control the direction of the body diode of the synchro switch pipe to be
The points of common connection of the power switch pipe and synchro switch pipe is pointed to from output end.
The control method and on-off circuit to the on-off circuit according to preferred embodiment of the present utility model are carried out above
Detailed description, but on the patent circuit and beneficial effect should not be considered as being limited only to it is described above, it is disclosed
Embodiment and accompanying drawing can be better understood from the utility model, therefore, and embodiment and Figure of description content disclosed above is
In order to be better understood from the utility model, the utility model protection is not limited to limit the scope of the present disclosure, the common skill in this area
Art personnel to the replacement of the utility model embodiment, change within protection domain of the present utility model.
Claims (4)
1. a kind of on-off circuit, including inductance, power switch pipe and synchro switch pipe, the inductance connection is in the on-off circuit
Input voltage and the power switch pipe and synchro switch pipe points of common connection between, it is characterised in that
The body diode of the synchro switch pipe includes the first diode and the second diode, the first diode and the second diode
Negative electrode connection, the anode of first diode connects the output end of the on-off circuit, the anode of second diode
Connect the points of common connection of the power switch pipe and synchro switch pipe.
2. on-off circuit according to claim 1, it is characterised in that
The on-off circuit further comprises first switch pipe, and the first switch pipe is connected in parallel on the two of first diode
End.
3. on-off circuit according to claim 1, it is characterised in that
The on-off circuit further comprises second switch pipe, and the second switch pipe is connected in parallel on the two of second diode
End.
4. on-off circuit according to claim 1, it is characterised in that
The on-off circuit further comprises the 3rd switching tube and the 4th switching tube, and the 3rd paralleled power switches are described first
The two ends of diode, the 4th paralleled power switches are at the two ends of second diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402987.0U CN206517295U (en) | 2016-12-20 | 2016-12-20 | A kind of on-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402987.0U CN206517295U (en) | 2016-12-20 | 2016-12-20 | A kind of on-off circuit |
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| Publication Number | Publication Date |
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| CN206517295U true CN206517295U (en) | 2017-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621402987.0U Active CN206517295U (en) | 2016-12-20 | 2016-12-20 | A kind of on-off circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418409A (en) * | 2018-03-19 | 2018-08-17 | 青岛大学 | Cache peak voltage switching tube and the Switching Power Supply topology with the switching tube |
| CN109756116A (en) * | 2019-01-30 | 2019-05-14 | 上海艾为电子技术股份有限公司 | Boost chip and its short-circuit protection circuit |
-
2016
- 2016-12-20 CN CN201621402987.0U patent/CN206517295U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108418409A (en) * | 2018-03-19 | 2018-08-17 | 青岛大学 | Cache peak voltage switching tube and the Switching Power Supply topology with the switching tube |
| CN109756116A (en) * | 2019-01-30 | 2019-05-14 | 上海艾为电子技术股份有限公司 | Boost chip and its short-circuit protection circuit |
| CN109756116B (en) * | 2019-01-30 | 2024-03-01 | 上海艾为电子技术股份有限公司 | Boost chip and short-circuit protection circuit thereof |
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