CN209402420U - Frequency segmentation circuit and switching power circuit - Google Patents
Frequency segmentation circuit and switching power circuit Download PDFInfo
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- CN209402420U CN209402420U CN201821447794.6U CN201821447794U CN209402420U CN 209402420 U CN209402420 U CN 209402420U CN 201821447794 U CN201821447794 U CN 201821447794U CN 209402420 U CN209402420 U CN 209402420U
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Abstract
The utility model relates to a kind of frequency segmentation circuit and switching power circuits, the input terminal of threshold value judgment module accesses sampled voltage, when sampled voltage is greater than preset threshold, threshold value judgment module outputs a control signal to the controlled end of control switch module, the input terminal of control switch module is connected with output end, first starting of oscillation module can be used for adjusting the working frequency of circuit to be adjusted with one or more second starting of oscillation module composition frequency oscillation circuits, the frequency oscillation circuit.Wherein, the preset threshold of different threshold value judgment modules is different, can be according to sampled voltage size, and the input terminal for controlling different control switch modules is connected with output end, form multiple frequency oscillation circuits being in parallel, and sampled voltage size and frequency oscillation circuit number correlation in parallel.Based on this, when sampled voltage is larger, the working frequency of circuit to be adjusted is reduced, to reduce the loss of semiconductor devices.Based on this, the volume of balancing transformer and the loss of semiconductor devices.
Description
Technical field
The utility model relates to hardware circuit technical fields, more particularly to a kind of frequency segmentation circuit and switch power supply
Road.
Background technique
In the circuit of traditional fixed-frequency control, design of transformer and volume are related with the working frequency of circuit, if circuit
Working frequency fix, low pressure input when, transformer peak point current is big, so that current variation value is big, it is desirable that it is larger effectively cut
The magnetic core of transformer of area；In high input voltage, transformer peak point current is small, and current variation value is small, can be selected effective section smaller
The magnetic core of transformer of area.The effective sectional area size of magnetic core of transformer determines the volume of transformer.
Further, it if the power of circuit is fixed, in low pressure input, by the working frequency of boost circuit, can control
Current variation value, to control the effective sectional area requirement of magnetic core of transformer.
However, in high input voltage, the working frequency of circuit, which increases, partly to be led in accelerating circuit if the power of circuit is fixed
The loss of body device.Therefore, in the circuit of traditional fixed-frequency control, it is difficult to the volume of balancing transformer and semiconductor devices
Loss.
Utility model content
Based on this, it is necessary in the circuit of traditional fixed-frequency control, it is difficult to the volume of balancing transformer with partly lead
The problem of loss of body device, provides a kind of frequency segmentation circuit.
A kind of frequency segmentation circuit, including the first starting of oscillation module, multiple threshold value judgment modules, multiple control switch modules and
Multiple second starting of oscillation modules；Wherein, threshold value judgment module, control switch module and the second starting of oscillation module correspond；
The input terminal of each threshold value judgment module is used to access the sampled voltage of circuit to be adjusted；
The output end of each threshold value judgment module connects the controlled end of corresponding control switch module；
The output end that the first end of each second starting of oscillation module passes sequentially through corresponding control switch module is connect with input terminal
First common end；Wherein, the first common end is used to connect the first frequency adjustable side of circuit to be adjusted；
The second end of each second starting of oscillation module is separately connected the second common end；Wherein, the second common end is for connecting wait adjust
The second frequency adjustable side of circuit；
One end of first starting of oscillation module connects the second common end, and the other end is used to connect the third frequency tune of circuit to be adjusted
Save end；Wherein, when the input terminal of control switch module is connected with output end, the first starting of oscillation module can be with one or more second
Starting of oscillation module composition frequency oscillation circuit.
Threshold value judgment module includes diode in one of the embodiments,；
The cathode of diode is the input terminal of threshold value judgment module；
The just extremely output end of threshold value judgment module of diode.
Diode is transition diode in one of the embodiments,.
Control switch module includes transistor in one of the embodiments,；
The base stage of transistor is the controlled end of control switch module；
The input terminal of the transmitting extremely control switch module of transistor；
The output end of the current collection of transistor extremely control switch module.
Control switch module further includes the first adjusting resistance in one of the embodiments,；
The base stage of transistor adjusts the emitter that resistance connects transistor by first.
It in one of the embodiments, further include multiple second adjustings resistance；Second adjusts resistance and threshold value judgment module
It corresponds；
The input terminal connection second of each threshold value judgment module adjusts one end of resistance, and the other end of the second adjusting resistance is used for
Access sampled voltage.
Transistor is NPN triode in one of the embodiments,.
The first starting of oscillation module is oscillation resistance in one of the embodiments,.
The second starting of oscillation module is oscillating capacitance in one of the embodiments,.
Control switch module further includes anti-jamming circuit in one of the embodiments,；
The base stage of transistor connects the emitter of transistor by anti-jamming circuit.
A kind of switching power circuit, including pulse modulation module and above-mentioned frequency segmentation circuit；
The input terminal of each threshold value judgment module is used to access the voltage of big electrolytic capacitor in switching power circuit；
The output end of each threshold value judgment module connects the controlled end of corresponding control switch module；
The output end that the first end of each second starting of oscillation module passes sequentially through corresponding control switch module is connect with input terminal
First common end；Wherein, the first common end is used to connect the ground terminal of pulse modulation module；
The second end of each second starting of oscillation module is separately connected the second common end；Wherein, the second common end is for connecting pulse
The timing end of modulation module；
One end of first starting of oscillation module connects the second common end, and the other end is used to connect the benchmark electricity of pulse modulation module
Press output end；Wherein, when the input terminal of control switch module is connected with output end, the first starting of oscillation module can be with one or more
Second starting of oscillation module composition frequency oscillation circuit.
The input terminal of said frequencies segment circuit and switching power circuit, threshold value judgment module accesses sampled voltage, is adopting
When sample voltage is greater than preset threshold, threshold value judgment module outputs a control signal to the controlled end of control switch module, opens control
The input terminal for closing module is connected with output end, and the first starting of oscillation module can be with one or more second starting of oscillation module composition hunting of frequency
Circuit, the frequency oscillation circuit can be used for adjusting the working frequency of circuit to be adjusted.Wherein, different threshold value judgment modules is default
Threshold value is different, can be according to sampled voltage size, and the input terminal for controlling different control switch modules is connected with output end, is formed
Multiple frequency oscillation circuits being in parallel, and sampled voltage size and frequency oscillation circuit number correlation in parallel.Its
In, the working frequency negative correlation of frequency oscillation circuit number in parallel and circuit to be adjusted.When sampled voltage is smaller, improve
The working frequency of circuit to be adjusted, to reduce the volume of transformer；When sampled voltage is larger, the work frequency of circuit to be adjusted is reduced
Rate, to reduce the loss of semiconductor devices.Based on this, the volume of balancing transformer and the loss of semiconductor devices.
Detailed description of the invention
Fig. 1 is frequency segmentation circuit modular structure figure；
Fig. 2 is the frequency segmentation circuit diagram based on two threshold value judgment modules.
Specific embodiment
The purpose of this utility model, technical solution and technical effect in order to better understand, below in conjunction with attached drawing and reality
It applies example and further explaining illustration is carried out to the utility model.It states simultaneously, embodiments described below is only used for explaining this
Utility model is not used to limit the utility model.
The present embodiment is by taking circuit to be adjusted is the Switching Power Supply of fixed-frequency control as an example, to the volume and semiconductor devices of transformer
Loss relationship explain.It should be noted that circuit to be adjusted includes the circuit of a variety of fixed-frequency controls, it is not limited to switch electricity
Source.
The Switching Power Supply of traditional fixed-frequency control, design of transformer and volume, it is related with working frequency.Since traditional opens
Powered-down source working frequency is fixed, and according to formula B=△ I*L/ (N*Ae), wherein B is transformer flux, and N is primary side the number of turns, L
For transformer sensibility reciprocal, △ I is current variation value, and Ae is magnetic core of transformer effective sectional area, therefore in low pressure input, transformer
Peak point current it is big, need to select Ae value big.But when high input voltage, transformer peak point current is small, and Ae value can be selected opposite
Small.
Further, according to transformer sensibility reciprocal formula L=Vi*D/ (f* △ I), therefore when low pressure, equal-wattage and input
Under, working frequency increases, and △ I value reduces, and transformer can select Ae value small.But when high input voltage, since input voltage is high,
Semiconductor device switch loss is big.
Based on this, the embodiment of the present invention provides a kind of frequency segmentation circuit:
Fig. 1 is frequency segmentation circuit modular structure figure, as shown in Figure 1, frequency segmentation circuit includes the first starting of oscillation module
100, multiple threshold value judgment modules 101, multiple control switch modules 102 and multiple second starting of oscillation modules 103；Wherein, threshold value is sentenced
Disconnected module 101, control switch module 102 and the second starting of oscillation module 103 correspond；
The input terminal of each threshold value judgment module 101 is used to access the sampled voltage of circuit to be adjusted；
By taking circuit to be adjusted is the Switching Power Supply of fixed-frequency control as an example, sampled voltage can be the big electrolytic capacitor electricity of Switching Power Supply
Pressure.The input terminal of threshold value judgment module 101 accesses big electrolytic capacitor voltage, and big electrolytic capacitor voltage is compared with preset threshold
Compared with.If big electrolytic capacitor voltage is greater than preset threshold, the output end of threshold value judgment module 101 is exported for making control switch
The control signal of input terminal and the output end closure of module 102.
The preset threshold of different threshold value judgment modules 101 is different in one of the embodiments,.Wherein, each threshold decision
The preset threshold of module 101 can be in the linear relationship or curved relationship of certain slope, i.e., each preset threshold can arrange from small to large
Column.
Threshold value judgment module 101 is comparison circuit in one of the embodiments,.Wherein, an input of comparison circuit
End is for accessing sampled voltage, another input terminal of comparison circuit is for accessing reference voltage.After receiving sampled voltage,
Comparison circuit is compared sampled voltage with reference signal, exports comparison result, the control exported as threshold value judgment module 101
Signal processed.
Threshold value judgment module 101 is or circuit in one of the embodiments,.Wherein or an input terminal of circuit is used
In the other end of access sampled voltage or circuit for accessing low-potential signal.Wherein, threshold value judgment module 101 is preset as
Or the minimum high potential signal of circuit.After receiving sampled voltage, if sampled voltage is greater than the defeated of the threshold value or circuit set
Outlet exports high potential signal, the control signal exported as threshold value judgment module 101.
The output end of each threshold value judgment module 101 connects the controlled end of corresponding control switch module 102；
Fig. 2 is the frequency segmentation circuit diagram based on two threshold value judgment modules.
In one of the embodiments, as shown in Fig. 2, threshold value judgment module 101 includes diode D1；
The cathode of diode D1 is the input terminal of threshold value judgment module 101；
The just extremely output end of threshold value judgment module 101 of diode D1.
Wherein, the preset threshold of threshold value judgment module 101 is the reverse turn-on voltages of diode D1, and diode D1's is negative
Pole receives sampled voltage, when sampled voltage is greater than reverse turn-on voltages, diode D1 reverse-conducting, greater than adopting for preset threshold
Sample voltage is exported by the anode of diode D1, as control signal.
Wherein, as a kind of preferably embodiment, diode D1 selects transition diode D1.Threshold value judgment module 101
Select transition diode D1 so that transition diode D1 is in reverse-conducting, influence of the transition diode D1 to sampled voltage compared with
It is small.Meanwhile the breakdown probability of threshold value judgment module 101 is reduced, guarantee circuit the operation is stable.
Control switch module 102 includes transistor Q1 in one of the embodiments,；
The base stage of transistor Q1 is the controlled end of control switch module 102；
The input terminal of the transmitting extremely control switch module 102 of transistor Q1；
The output end of the current collection of transistor Q1 extremely control switch module 102.
As shown in Fig. 2, the base stage of transistor Q1 is upon the reception of control signals, due to control signal and the first common end
Potential difference, transistor Q1 conducting, the i.e. input terminal of control switch module 102 are connected with output end.
In one of the embodiments, as shown in Fig. 2, transistor Q1 is NPN triode.
It should be noted that the type of transistor Q1 is not limited only to above-mentioned restriction, can be connected according to the first common end
Signal source is adjusted.In Fig. 2 by taking the first common end grounding as an example, then transistor Q1 uses NPN triode.In principle, signal
Source is using there are the high potential signal sources of potential difference with power supply, and the potential difference is greater than the conducting voltage of transistor Q1.It is brilliant
Above-mentioned work-based logic then can be achieved in body pipe Q1, herein without repeating.
In one of the embodiments, as shown in Fig. 2, control switch module 102 further includes the first adjusting resistance R1；
The emitter that the base stage of transistor Q1 adjusts resistance R1 connection transistor by first.
As shown in Fig. 2, electric signal, that is, sampled voltage that threshold value judgment module 101 inputs, the first adjusting resistance R1 can be risen point
Pressure effect, and change the base potential of transistor Q1.Therefore, first resistance R1 is adjusted by adjusting the electricity of conducting transistor Q1
Position, transistor Q1 can be just connected by so that sampled voltage is reached different preset thresholds.Based on this, resistance R1 is adjusted by first, is changed
Variable sampling voltage meets the condition of transistor Q1 conducting, the preset threshold of Indirect method threshold value judgment module 101.
In one of the embodiments, as shown in Fig. 2, further including multiple second adjustings resistance R2；Second adjusts resistance R1
It is corresponded with threshold value judgment module 101；
The input terminal connection second of each threshold value judgment module 101 adjusts one end of resistance R2, and second adjusts the another of resistance R2
One end is for accessing sampled voltage.
First adjusting resistance R1 and the second adjusting resistance R2 are used as divider resistance, change the base potential of transistor Q1,
With the preset threshold of Indirect method threshold value judgment module 101.
Control switch module 102 further includes anti-jamming circuit in one of the embodiments,；
The base stage of transistor Q1 connects the emitter of transistor Q1 by anti-jamming circuit.
Wherein, as shown in Fig. 2, using RC circuit as anti-jamming circuit, the anti-interference ability of transistor Q1 is improved.
In one of the embodiments, as shown in Fig. 2, control switch module 102 further includes current-limiting resistance R3, threshold decision
The output end of module 101 passes through the base stage of current-limiting resistance R3 connection transistor Q1.By current-limiting resistance R3, to protect transistor
Q1 prevents overcurrent.
The first end of each second starting of oscillation module 103 passes sequentially through output end and the input of corresponding control switch module 102
The first common end C1 of end connection；Wherein, the first common end C1 is used to connect the first frequency adjustable side of circuit to be adjusted；
The second end of each second starting of oscillation module 103 is separately connected the second common end C2；Wherein, the second common end C2 is used for
Connect the second frequency adjustable side of circuit to be adjusted；
Wherein, the first end of each second starting of oscillation module 103 connects the first common end C1, and the of each second starting of oscillation module 103
Two ends connect the second common end C2, and each second starting of oscillation module 103 is made to be in parallel.
In one of the embodiments, as shown in Fig. 2, the first starting of oscillation module 100 is oscillation resistance RT.
In one of the embodiments, as shown in Fig. 2, the second starting of oscillation module 103 is oscillating capacitance CTn.
Wherein, the first starting of oscillation module 100 and the second starting of oscillation module 103 constitute RC oscillating circuit.Optionally, the first starting of oscillation mould
Different devices can be selected from the second starting of oscillation module 103 in block 100, to constitute different types of frequency oscillation circuit, such as LC vibration
Swing circuit etc..
One end of first starting of oscillation module 100 connects the second common end C2, and the other end is used to connect the third of circuit to be adjusted
Frequency adjustable side；Wherein, when the input terminal of control switch module 102 is connected with output end, the first starting of oscillation module 100 can be with one
A or multiple second starting of oscillation modules 103 constitute frequency oscillation circuit.
Wherein, the frequency oscillation circuit that the first starting of oscillation module 100 and the second starting of oscillation module 103 are constituted, can pass through first
Frequency adjustable side and second frequency adjustable side adjust the working frequency of circuit to be adjusted.
As shown in Fig. 2, the second starting of oscillation module 103 is respectively oscillating capacitance with the first starting of oscillation module 100 for oscillation resistance RT
For the frequency oscillation circuit that CT1 and CT2 is constituted, frequency control is carried out to the Switching Power Supply of fixed-frequency control.Further, for more
It is easy to understand, is explained by taking UC3842 chip specified in Switching Power Supply as an example.Wherein, first frequency adjustable side is UC3842 core
The timing end RT/CT of piece, second frequency adjustable side are the reference voltage output end VREF of UC3842 chip.That is the second common end C2
Connect the timing end RT/CT of UC3842 chip, the benchmark electricity that third common end C3 passes through oscillation resistance RT connection UC3842 chip
Press output end VREF.
As shown in Fig. 2, when sampled voltage be greater than the first preset threshold less than the second preset threshold when, oscillating capacitance CT1 with
Oscillation resistance RT connects and composes frequency oscillation circuit, and oscillating capacitance CT2 is not connect with oscillation resistance RT.It is based on UC3842 at this time
The working frequency of the Switching Power Supply of chip is f_low=1.72/ (RT*CT1).When sampled voltage is greater than the second preset threshold,
Oscillating capacitance CT1 and CT2 are connect with oscillation resistance RT, constitute two frequency oscillation circuits being in parallel.It is based at this time
The working frequency of the Switching Power Supply of UC3842 chip is f_high=1.72/ [RT* (CT1+CT2)].It can be seen that f_low is greater than f_
high.Oscillating capacitance CTn is greater than in two situations, working frequency of Switching Power Supply and so on.
Provide a kind of switching power circuit in one of the embodiments, including pulse modulation module and any of the above-described
The frequency segmentation circuit of embodiment；
The input terminal of each threshold value judgment module is used to access the voltage of big electrolytic capacitor in switching power circuit；
The output end of each threshold value judgment module connects the controlled end of corresponding control switch module；
The output end that the first end of each second starting of oscillation module passes sequentially through corresponding control switch module is connect with input terminal
First common end；Wherein, the first common end is used to connect the ground terminal of pulse modulation module；
The second end of each second starting of oscillation module is separately connected the second common end；Wherein, the second common end is for connecting pulse
The timing end of modulation module；
One end of first starting of oscillation module connects the second common end, and the other end is used to connect the benchmark electricity of pulse modulation module
Press output end；Wherein, when the input terminal of control switch module is connected with output end, the first starting of oscillation module can be with one or more
Second starting of oscillation module composition frequency oscillation circuit.
Wherein, the pulse modulation module includes UC3842 current-control type pulse width modulating chip.
The input terminal of said frequencies segment circuit and switching power circuit, threshold value judgment module 101 accesses sampled voltage,
When sampled voltage is greater than preset threshold, threshold value judgment module 101 outputs a control signal to the controlled end of control switch module 102,
The input terminal of control switch module 102 is connected with output end, the first starting of oscillation module 100 can be with one or more second starting of oscillation moulds
Block 103 constitutes frequency oscillation circuit, which can be used for adjusting the working frequency of circuit to be adjusted.Wherein, different
The preset threshold of threshold value judgment module 101 is different, can control different control switch modules 102 according to sampled voltage size
Input terminal be connected with output end, form multiple frequency oscillation circuits being in parallel, and sampled voltage size and frequency in parallel
Oscillating circuit number correlation.Wherein, frequency oscillation circuit number in parallel and the working frequency of circuit to be adjusted are negatively correlated
Relationship.When sampled voltage is smaller, the working frequency of circuit to be adjusted is improved, to reduce the volume of transformer；Sampled voltage compared with
When big, the working frequency of circuit to be adjusted is reduced, to reduce the loss of semiconductor devices.Based on this, the volume of balancing transformer with
The loss of semiconductor devices.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Above embodiments only express the several embodiments of the utility model, and the description thereof is more specific and detailed, but simultaneously
The limitation to utility model patent range therefore cannot be interpreted as.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the concept of the premise utility, various modifications and improvements can be made, these belong to this reality
With novel protection scope.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of frequency segmentation circuit, which is characterized in that including the first starting of oscillation module, multiple threshold value judgment modules, multiple controls
Switch module and multiple second starting of oscillation modules；Wherein, the threshold value judgment module, the control switch module and described second
Module of shaking corresponds；
The input terminal of each threshold value judgment module is used to access the sampled voltage of circuit to be adjusted；
The output end of each threshold value judgment module connects the controlled end of the corresponding control switch module；
The first end of each second starting of oscillation module passes sequentially through the output end and input terminal of the corresponding control switch module
Connect the first common end；Wherein, first common end is used to connect the first frequency adjustable side of circuit to be adjusted；
The second end of each second starting of oscillation module is separately connected the second common end；Wherein, second common end is for connecting
The second frequency adjustable side of circuit to be adjusted；
One end of the first starting of oscillation module connects second common end, and the other end is used to connect the third frequency of circuit to be adjusted
Rate adjustable side；Wherein, when the input terminal of the control switch module is connected with output end, the first starting of oscillation module can be with one
A or multiple second starting of oscillation module composition frequency oscillation circuits.
2. frequency segmentation circuit according to claim 1, which is characterized in that the threshold value judgment module includes diode；
The cathode of the diode is the input terminal of the threshold value judgment module；
The output end of the just extremely described threshold value judgment module of the diode.
3. frequency segmentation circuit according to claim 2, which is characterized in that the diode is transition diode.
4. frequency segmentation circuit according to claim 1, which is characterized in that the control switch module includes transistor；
The base stage of the transistor is the controlled end of the control switch module；
The input terminal of the extremely described control switch module of transmitting of the transistor；
The output end of the extremely described control switch module of the current collection of the transistor.
5. frequency segmentation circuit according to claim 4, which is characterized in that the control switch module further includes the first tune
Economize on electricity resistance；
The base stage of the transistor connects the emitter of the transistor by the first adjusting resistance.
6. frequency segmentation circuit according to claim 5, which is characterized in that further include multiple second adjustings resistance；It is described
Second adjusts resistance and threshold value judgment module one-to-one correspondence；
The input terminal of each threshold value judgment module connects described second one end for adjusting resistance, and described second adjusts the another of resistance
One end is for accessing sampled voltage.
7. frequency segmentation circuit according to claim 1, which is characterized in that the first starting of oscillation module is oscillation resistance,
The second starting of oscillation module is oscillating capacitance.
8. frequency segmentation circuit according to claim 4, which is characterized in that the transistor includes NPN triode.
9. frequency segmentation circuit according to claim 4, which is characterized in that the control switch module further includes anti-interference
Circuit；
The base stage of the transistor connects the emitter of the transistor by the anti-jamming circuit.
10. a kind of switching power circuit, which is characterized in that including pulse modulation module and such as claim 1 to 9 any one institute
The frequency segmentation circuit stated；
The input terminal of each threshold value judgment module is used to access the voltage of big electrolytic capacitor in switching power circuit；
The output end of each threshold value judgment module connects the controlled end of the corresponding control switch module；
The first end of each second starting of oscillation module passes sequentially through the output end and input terminal of the corresponding control switch module
Connect the first common end；Wherein, first common end is used to connect the ground terminal of the pulse modulation module；
The second end of each second starting of oscillation module is separately connected the second common end；Wherein, second common end is for connecting
The timing end of the pulse modulation module；
One end of the first starting of oscillation module connects second common end, and the other end is for connecting the pulse modulation module
Reference voltage output end；Wherein, when the input terminal of the control switch module is connected with output end, the first starting of oscillation mould
Block can be with one or more second starting of oscillation module composition frequency oscillation circuits.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113049048A (en) * | 2019-12-27 | 2021-06-29 | 比特大陆科技有限公司 | Voltage adjustment method and device and processing equipment |
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| CN113049048A (en) * | 2019-12-27 | 2021-06-29 | 比特大陆科技有限公司 | Voltage adjustment method and device and processing equipment |
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