CN108227810A - A kind of energy saving current-limiting circuit and the source of stable pressure with the energy saving current-limiting circuit - Google Patents
A kind of energy saving current-limiting circuit and the source of stable pressure with the energy saving current-limiting circuit Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The embodiment of the present invention provides a kind of energy saving current-limiting circuit and the source of stable pressure with the energy saving current-limiting circuit, including：Limit detection circuit (31), control circuit for pulse-width modulation (32) and switching circuit (33)；The input terminal of the limit detection circuit (31) connects the input terminal (Vin) of the energy saving current-limiting circuit (3), first output terminal of the limit detection circuit (31) is connected to the input terminal of the switching circuit (33), the second output terminal of the limit detection circuit (31) is connected to the first input end of the control circuit for pulse-width modulation (32), to provide current limliting detection voltage (Vtest) to the control circuit for pulse-width modulation (32)；The output terminal of the switching circuit (33) is connected to the output terminal (Vout) of the energy saving current-limiting circuit (3)；The second input terminal connection current limliting reference voltage (Vref) of the control circuit for pulse-width modulation (32), output terminal are connected to the control terminal of the switching circuit (33).
Description
Technical field
The present invention relates to technical field of integrated circuits more particularly to a kind of energy saving current-limiting circuit and with the energy saving current limliting electricity
The source of stable pressure on road.
Background technology
With the continuous development of integrated circuit technique, current-limiting protection circuit is widely used in the various electricity for needing current control
Lu Zhong.It is briefly explained below for two kinds of typical traditional current-limiting protection circuits.
Fig. 1 shows the composition structure diagram of common tradition current-limiting protection circuit in the relevant technologies.As shown in Figure 1,
Resistance R2 provides triode Q1 bias currents, and Q1 saturation conductions do not play electric current control action, resistance R1 resistance value very littles,
R1 both ends pressure drop also very little, output voltage Vout=Vin-Vce-I*R1；When electric current is greater than or equal to current limit threshold, R1 both ends
Voltage increase so that the collector voltage Vc of Q1 becomes closer to base voltage Vb, Q1 and enters amplification region, starts to limit Q1
Amplification electric current Ice continues to increase, so as to play the role of limiting electric current.
Chinese patent discloses CN103049029B and also provides the current-limiting protection electricity similar with circuit shown in above-mentioned Fig. 1
Road, as shown in Fig. 2, the filter capacitor that the circuit includes two current sampling resistor R38, R39 in parallel, is connected with output terminal
C26, current limliting triode Q7, control triode Q8, control switching transistor Q9, filter capacitor C26 ground connection；Current limliting triode Q7's
Base stage is with controlling the collector of triode Q8 to connect；The collector of current limliting triode Q7 is connect with output terminal；Current limliting triode Q7
Emitter connect with power circuit output end VCC；The base stage of control triode Q8 is connected with power circuit output end VCC；Control
The emitter of triode Q8 processed is connect with+12V power supplys；Two current sampling resistors R38, R39 in parallel are connected to power circuit
Between output terminal VCC and+12V power supplys；Control the emitter ground connection of switching transistor Q9；Control the base stage of switching transistor Q9 with
Enable signal end connects, and is connected with current-limiting resistance R42 therebetween；The collector of switching transistor Q9 is controlled with current limliting triode Q7's
Base stage is connected, and is in series with divider resistance R40 therebetween；The collector of control triode Q8 is connect with+12V power supplys, is connected with therebetween
Divider resistance R41.The current limliting principle of the circuit and the current limliting principle of circuit shown in Fig. 1 are essentially identical, are all by controlling three poles
Pipe base current limits the electric current for flowing through triode.
However, above-mentioned Fig. 1 and current-limiting protection circuit shown in Fig. 2 there are one it is serious the problem of.Specifically, work as output
When electric current is more than current limit threshold, when particularly short circuit occurs, all pressure drops are all concentrated on triode, and the power consumption of triode is non-
Chang great, most of energy are consumed by triode with form of heat, cause unnecessary energy loss, capacity usage ratio is very
It is low.If moreover, when being in short-circuit condition for a long time, triode works long hours in big power consumption state, it is easy to because more than three poles
The heat dissipation power consumption threshold value of pipe and the damage for leading to triode, so as to influence the stability of entire current-limiting protection circuit.
Invention content
Effectively to solve Related Technical Issues, the embodiment of the present invention provides a kind of energy saving current-limiting circuit and with the energy saving limit
The source of stable pressure of current circuit.
According to the first aspect of the invention, the embodiment of the present invention provides a kind of energy saving current-limiting circuit 3, including：Current limliting detects
Circuit 31, control circuit for pulse-width modulation 32 and switching circuit 33；Wherein, the input terminal connection institute of the limit detection circuit 31
The input terminal Vin of energy saving current-limiting circuit 3 is stated, the first output terminal of the limit detection circuit 31 is connected to the switching circuit 33
Input terminal, the second output terminal of the limit detection circuit 31 is connected to the first input of the control circuit for pulse-width modulation 32
End, to provide current limliting detection voltage Vtest to the control circuit for pulse-width modulation 32；The output terminal connection of the switching circuit 33
To the output end vo ut of the energy saving current-limiting circuit 3；The second input terminal connection current limliting ginseng of the control circuit for pulse-width modulation 32
Voltage Vref is examined, the output terminal of the control circuit for pulse-width modulation 32 is connected to the control terminal of the switching circuit 33, to pass through
The duty ratio of itself is modulated, and then control to the comparison of current limliting detection voltage Vtest and the current limliting reference voltage Vref
The opening time of the switching circuit 33 is made, so as to adjust the output current Iout.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, the limit detection circuit 31 includes at least：It adopts
Sample resistance Rsense and differential-to-single-ended circuit；The first end of the sampling resistor Rsense is the limit detection circuit 31
Input terminal, the second end of the sampling resistor Rsense are the first output terminal of the limit detection circuit 31；The difference turns
The first input end of single-end circuit and the second input terminal connect the first end and second end of the sampling resistor Rsense respectively, with
The sampled voltage formed to the first end and second end by the sampling resistor Rsense carries out gain amplification, so as to obtain
State current limliting detection voltage Vtest；Second output of the output terminal of the differential-to-single-ended circuit for the limit detection circuit 31
End.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, further comprise low-pass filter 34, it is described low
Bandpass filter 34 is connected to the output terminal of the differential-to-single-ended circuit and the first input of the control circuit for pulse-width modulation 32
Between end.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, further comprise rectification circuit 35, the rectification
Circuit 35 is connected between the output terminal of the switching circuit 33 and the output terminal of the energy saving current-limiting circuit 3.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, the switching circuit 33 is NMOS tube, described
The drain electrode of NMOS tube is input terminal, and the source electrode of the NMOS tube is output terminal, and the grid of the NMOS tube is held in order to control.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, current limit threshold is less than in output current Iout
In the case of, the duty ratio of the control circuit for pulse-width modulation is up to first threshold, so as to ensure at the energy saving current-limiting circuit 3
In working condition.
It is more than current limit threshold in output current Iout in the energy saving current-limiting circuit 3 described in an embodiment of the present invention
In the case of, the current limliting detection voltage Vtest generated by the limit detection circuit 31 is more than the current limliting reference voltage Vref,
The control circuit for pulse-width modulation 32 detects voltage Vtest according to the current limliting and reduces duty ratio, and then shortens the switch electricity
The opening time on road 33, so as to reduce the output current Iout.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, reduce the output current Iout until being less than
In the case of current limit threshold, the current limliting detection voltage Vtest generated by the limit detection circuit 31 joins less than the current limliting
Voltage Vref is examined, the control circuit for pulse-width modulation 32 detects voltage Vtest according to the current limliting increases duty ratio, and then extend
The opening time of the switching circuit 33, so as to increase the output current Iout.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, when short circuit occurs for the energy saving current-limiting circuit 3
In the case of, the duty ratio of the control circuit for pulse-width modulation 33 is off down to second threshold, the at this time switching circuit 33
State.
According to the second aspect of the invention, the embodiment of the present invention also provides a kind of source of stable pressure 5, including：Reference voltage generates
Circuit 51 and the energy saving current-limiting circuit 3 as described in above-mentioned first aspect and any embodiment；Wherein, the energy saving current-limiting circuit
3, in output current Iout overcurrents, current limliting to be carried out to the output current Iout；The generating circuit from reference voltage 51,
The control circuit for pulse-width modulation 32 being connected in the energy saving current-limiting circuit 3, for generating current limliting reference voltage Vref.
Energy saving current-limiting circuit 3 described in the embodiment of the present invention, the limit detection circuit 31 pass through Rsense pairs of sampling resistor
Input current is sampled to obtain sampled voltage Vsense, and the sampled voltage Vsense is carried out gain amplification, with life
Into current limliting detection voltage Vtest；Further, the control circuit for pulse-width modulation 32 receives the current limliting detection voltage Vtest,
And the comparison of voltage Vtest and current limliting reference voltage Vref is detected to modulate the duty ratio of itself, and then control by the current limliting
The opening time of the switching circuit 32 is made, so as to increase or reduce the output current Iout.It so, it is possible in output current
In the case of current threshold more than setting, prevent entire circuit from being damaged because electric current is excessive with power supply circuit because electric current is excessive
Operation irregularity, compared to traditional current-limiting protection circuit, which enters energy loss very little under limited current state, energy profit
It is very high with rate and more reliable and more stable.
Description of the drawings
Detailed description below, above-mentioned and other mesh of exemplary embodiment of the invention are read by reference to attached drawing
, feature and advantage will become prone to understand.In the accompanying drawings, if showing the present invention's by way of example rather than limitation
Dry embodiment, wherein：
In the accompanying drawings, identical or corresponding label represents identical or corresponding part.
Fig. 1 shows the composition structure diagram of common tradition current-limiting protection circuit in the relevant technologies；
Fig. 2 shows the composition structure diagrams of tradition current-limiting protection circuit common in the relevant technologies；
Fig. 3 shows the composition structure diagram of the energy saving current-limiting circuit of the embodiment of the present invention；
Fig. 4 shows the concrete composition structural representation of energy saving current-limiting circuit in an embodiment according to embodiments of the present invention
Figure；
Fig. 5 shows the composition structure diagram of source of stable pressure of the embodiment of the present invention.
Component label instructions：
3 energy saving current-limiting circuits
31 limit detection circuits
32 control circuit for pulse-width modulation
33 switching circuits
34 low-pass filters
35 rectification circuits
5 source of stable pressure
51 generating circuit from reference voltage
Specific embodiment
The principle and spirit of the invention are described below with reference to several illustrative embodiments.It should be appreciated that provide this
A little embodiments are not with any just for the sake of better understood when those skilled in the art and then realize the present invention
Mode limits the scope of the invention.On the contrary, these embodiments are provided so that the disclosure is more thorough and complete, and energy
It is enough that the scope of the present disclosure is completely communicated to those skilled in the art.
The specific embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Fig. 3 shows the composition structure diagram of the energy saving current-limiting circuit of the embodiment of the present invention；Fig. 4 is shown according to the present invention
The concrete composition structure diagram of energy saving current-limiting circuit in one embodiment of embodiment.
It please refers to Fig.3 and Fig. 4, the embodiment of the present invention provides energy saving current-limiting circuit 3 as shown in Figure 3, the energy saving current limliting electricity
Road 3 includes：Limit detection circuit 31, control circuit for pulse-width modulation 32 and switching circuit 33；Wherein, the limit detection circuit
31 input terminal connects the input terminal Vin of the energy saving current-limiting circuit 3, the first output terminal connection of the limit detection circuit 31
To the input terminal of the switching circuit 33, the second output terminal of the limit detection circuit 31 is connected to the pulse width modulation controlled
The first input end of circuit 32, to provide current limliting detection voltage Vtest to the control circuit for pulse-width modulation 32；The switch electricity
The output terminal on road 33 is connected to the output end vo ut of the energy saving current-limiting circuit 3；The second of the control circuit for pulse-width modulation 32
Input terminal connects current limliting reference voltage Vref, and the output terminal of the control circuit for pulse-width modulation 32 is connected to the switching circuit 33
Control terminal, to modulate itself by detecting the comparison of voltage Vtest and the current limliting reference voltage Vref to the current limliting
Duty ratio, and then the opening time of the switching circuit 33 is controlled, so as to adjust the output current Iout.
In embodiment as shown in Figure 4, the limit detection circuit 31 includes at least：Sampling resistor Rsense and difference
Divide and turn single-end circuit；Input terminal of the first end of the sampling resistor Rsense for the limit detection circuit 31, the sampling
The second end of resistance Rsense is the first output terminal of the limit detection circuit 31；The first of the differential-to-single-ended circuit is defeated
Enter end and the second input terminal connects the first end and second end of the sampling resistor Rsense respectively, with to by the sampling resistor
The sampled voltage that the first end and second end of Rsense is formed carries out gain amplification, so as to obtain the current limliting detection voltage
Vtest；The output terminal of the differential-to-single-ended circuit is the second output terminal of the limit detection circuit 31.
In practical applications, the limit detection circuit 31 input current is sampled by sampling resistor Rsense with
Sampled voltage Vsense is obtained, and the sampled voltage Vsense is subjected to gain amplification, to generate current limliting detection voltage
Vtest；Further, the control circuit for pulse-width modulation 32 receives the current limliting detection voltage Vtest, and passes through the current limliting
The comparison of voltage Vtest and current limliting reference voltage Vref is detected to modulate the duty ratio of itself, and then control the switching circuit
32 opening time, so as to increase or reduce the output current Iout.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, further comprise low-pass filter 34, it is described low
Bandpass filter 34 is connected to the output terminal of the differential-to-single-ended circuit and the first input of the control circuit for pulse-width modulation 32
Between end, as PWM first input end between.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, further comprise rectification circuit 35, the rectification
Circuit 35 is connected between the output terminal of the switching circuit 33 and the output terminal of the energy saving current-limiting circuit 3.
In the energy saving current-limiting circuit 3 described in an embodiment of the present invention, the switching circuit 33 can be NMOS tube, institute
The drain electrode for stating NMOS tube is input terminal, and the source electrode of the NMOS tube is output terminal, and the grid of the NMOS tube is held in order to control.When
So, in practical applications, the switching circuit 33 can also be the three class control door formed as combined by arbitrarily integrated component
Circuit.
Based on such as Fig. 3 and/or energy saving current-limiting circuit 3 shown in Fig. 4, it can analyze and obtain the energy saving current-limiting circuit 3
Following several working conditions：
Situation one, in the case where output current Iout is less than current limit threshold, the control circuit for pulse-width modulation 32
Duty ratio is up to first threshold, so as to ensure that the energy saving current-limiting circuit 3 is in running order.Wherein, the first threshold
Ideal values are 100%.In practical applications, in the case where output current Iout is less than current limit threshold, the pulsewidth tune
The duty ratio of control circuit 32 processed can only be infinite approach 100%.
Situation two in the case where output current Iout is more than current limit threshold, is generated by the limit detection circuit 31
Current limliting detection voltage Vtest be more than the current limliting reference voltage Vref, the control circuit for pulse-width modulation 32 is according to the limit
Stream detection voltage Vtest reduces duty ratio, and then shorten the opening time of the switching circuit 33, NMOS tube as shown in Figure 4
Opening time, so as to reduce the output current Iout.
Situation three on the basis of situation two, further reduces the output current Iout until less than current limit threshold
In the case of, the current limliting detection voltage Vtest generated by the limit detection circuit 31 is less than the current limliting reference voltage Vref,
The control circuit for pulse-width modulation 32 detects voltage Vtest according to the current limliting increases duty ratio, and then extends the switch electricity
The opening time on road 33, the opening time of NMOS tube as shown in Figure 4, so as to increase the output current Iout.
Situation four, in the case that short circuit occurs for the energy saving current-limiting circuit 3, the control circuit for pulse-width modulation 33 accounts for
Sky ratio is off state down to second threshold, the at this time switching circuit 33.Wherein, the ideal values of the second threshold are
0%.In practical applications, in the case that short circuit occurs for the energy saving current-limiting circuit 3, the control circuit for pulse-width modulation 33
Duty ratio can only be substantially equal to 0%.
Energy saving current-limiting circuit 3 described in the embodiment of the present invention and traditional current-limiting protection circuit phase as shown in Figure 1 or 2
Than there is advantage as is evident below：
First, the good energy saving property of the energy saving current-limiting circuit 3.Traditional circuit enters under limited current state, in addition to will be by current limliting
The electric current of circuit is limited to outside the current limit threshold of setting, and extra energy is all consumed by current-limiting protection circuit by form of heat
Fall, energy utilization rate is very low；And energy saving current-limiting circuit 3 described in the embodiment of the present invention is after limited current state is entered, current limliting is electric
Road is limited to the current limit threshold of setting, and self-energy consumption is considerably less, and energy utilization rate is very high, is saved compared to traditional circuit
Very high energy.
Second, the stability of the energy saving current-limiting circuit 3 is high.All power consumptions are added in three after traditional current-limiting circuit enters current limliting
Pole pipe both ends, triode work long hours and easily damage；And energy saving current-limiting circuit 3 described in the embodiment of the present invention is entering current limliting shape
It is consumed after state by adjusting PWM limitation electric current outputs rather than by additional energy by self-radiating, into limited current state
The stability that works long hours is obviously improved.
Third, the energy saving current-limiting circuit 3 can continue to be maintained at normal working condition after entering limited current state.Tradition
The consumption of energy almost all obtains seldom, influencing to be limited on current limliting triode by current-limiting circuit after current-limiting circuit enters current limliting
The normal work of current circuit cannot even work；And energy saving current-limiting circuit 3 described in the embodiment of the present invention enter limited current state after,
It is remained to obtain most energy by current-limiting circuit, not influence by the normal work of current-limiting circuit.
In this way, energy saving current-limiting circuit 3 described in the embodiment of the present invention, the limit detection circuit 31 pass through sampling resistor
Rsense samples input current to obtain sampled voltage Vsense, and sampled voltage Vsense progress gains is put
Greatly, voltage Vtest is detected to generate current limliting；Further, the control circuit for pulse-width modulation 32 receives the current limliting detection electricity
Vtest is pressed, and the comparison of voltage Vtest and current limliting reference voltage Vref is detected to modulate the duty of itself by the current limliting
Than, and then the opening time of the switching circuit 32 is controlled, so as to increase or reduce the output current Iout.It so, it is possible
In the case where output current Iout is more than the current threshold of setting, prevent entire circuit from damaging and powering because electric current is excessive
The excessive operation irregularity of circuit because electric current, compared to traditional current-limiting protection circuit, which enters energy under limited current state
Very little is lost, energy utilization rate is very high, and more reliable and more stable.
With reference to above-mentioned described energy saving current-limiting circuit 3, the embodiment of the present invention additionally provides a kind of source of stable pressure.
Fig. 5 shows the composition structure diagram of source of stable pressure of the embodiment of the present invention.
With reference to figure 5, which includes：The above-mentioned energy saving current limliting as involved by Fig. 3 or Fig. 4 and its any embodiment
Circuit 3, the energy saving current-limiting circuit 3, in output current Iout overcurrents, current limliting to be carried out to the output current Iout；
And the control circuit for pulse-width modulation 32 in the energy saving current-limiting circuit 3 is connected to, and for generating current limliting reference voltage Vref
Generating circuit from reference voltage 51.Wherein, the value of the current limliting reference voltage Vref and the entire energy saving current-limiting circuit 3
Current limit threshold is positively correlated.
Source of stable pressure 5 described in the embodiment of the present invention, using the above-mentioned section as involved by Fig. 3 or Fig. 4 and its any embodiment
Energy current-limiting circuit 3 realizes specified cut-off current and carries out effective current limliting to output current.
Although describe spirit and principles of the present invention by reference to several specific embodiments, it should be appreciated that, this
Invention is not limited to disclosed specific embodiment, does not also mean that the feature in these aspects cannot to the division of various aspects
Combination is this to divide merely to the convenience of statement to be benefited.The present invention is directed to cover appended claims spirit and
In the range of included various modifications and equivalent arrangements.
Claims (10)
1. a kind of energy saving current-limiting circuit (3), including：Limit detection circuit (31), control circuit for pulse-width modulation (32) and switch
Circuit (33)；Wherein,
The input terminal of the limit detection circuit (31) connects the input terminal (Vin) of the energy saving current-limiting circuit (3), the current limliting
First output terminal of detection circuit (31) is connected to the input terminal of the switching circuit (33), the limit detection circuit (31)
Second output terminal is connected to the first input end of the control circuit for pulse-width modulation (32), with to the control circuit for pulse-width modulation
(32) current limliting detection voltage (Vtest) is provided；
The output terminal of the switching circuit (33) is connected to the output terminal (Vout) of the energy saving current-limiting circuit (3)；
The second input terminal connection current limliting reference voltage (Vref) of the control circuit for pulse-width modulation (32), the pulsewidth modulation control
The output terminal of circuit (32) processed is connected to the control terminal of the switching circuit (33), with by detecting voltage to the current limliting
(Vtest) duty ratio of itself is modulated, and then control the switching circuit with the comparison of the current limliting reference voltage (Vref)
(33) opening time, so as to adjust the output current (Iout).
2. energy saving current-limiting circuit (3) according to claim 1, wherein, the limit detection circuit (31) includes at least：It adopts
Sample resistance (Rsense) and differential-to-single-ended circuit；
Input terminal of the first end of the sampling resistor (Rsense) for the limit detection circuit (31), the sampling resistor
(Rsense) second end is the first output terminal of the limit detection circuit (31)；
The first input end of the differential-to-single-ended circuit and the second input terminal connect the sampling resistor (Rsense) respectively
First end and second end is carried out with the sampled voltage formed to the first end and second end by the sampling resistor (Rsense)
Gain is amplified, so as to obtain the current limliting detection voltage (Vtest)；
The output terminal of the differential-to-single-ended circuit is the second output terminal of the limit detection circuit (31).
3. energy saving current-limiting circuit (3) according to claim 2, further comprises low-pass filter (34), the low pass filtered
Wave device (34) is connected to the output terminal of the differential-to-single-ended circuit and the first input of the control circuit for pulse-width modulation (32)
Between end.
4. energy saving current-limiting circuit (3) according to claim 2, further comprises rectification circuit (35), the rectification circuit
(35) it is connected between the output terminal of the switching circuit (33) and the output terminal of the energy saving current-limiting circuit (3).
5. energy saving current-limiting circuit (3) according to claim 1, wherein,
The switching circuit (33) is NMOS tube, and the drain electrode of the NMOS tube is input terminal, and the source electrode of the NMOS tube is output
End, the grid of the NMOS tube are held in order to control.
6. energy saving current-limiting circuit (3) according to any one of claims 1 to 5, wherein, it is less than in output current (Iout)
In the case of current limit threshold, the duty ratio of the control circuit for pulse-width modulation is up to first threshold, so as to ensure the energy saving limit
Current circuit (3) is in running order.
7. energy saving current-limiting circuit (3) according to any one of claims 1 to 5, wherein, in output current (Iout) more than limit
In the case of flowing threshold value, the current limliting detection voltage (Vtest) generated by the limit detection circuit (31) is more than the current limliting
Reference voltage (Vref), the control circuit for pulse-width modulation (32) detect voltage (Vtest) according to the current limliting and reduce duty ratio,
And then shorten the opening time of the switching circuit (33), so as to reduce the output current (Iout).
8. energy saving current-limiting circuit (3) according to any one of claims 1 to 5, wherein, reduce the output current (Iout)
Until less than in the case of current limit threshold, the current limliting detection voltage (Vtest) generated by the limit detection circuit (31) is low
In the current limliting reference voltage (Vref), the control circuit for pulse-width modulation (32) detects voltage (Vtest) according to the current limliting
Increase duty ratio, and then extend the opening time of the switching circuit (33), so as to increase the output current (Iout).
9. energy saving current-limiting circuit (3) according to any one of claims 1 to 5, wherein, when the energy saving current-limiting circuit (3)
In the case of short circuit occurs, the duty ratio of the control circuit for pulse-width modulation (33) is down to second threshold, and the switch is electric at this time
Road (33) is off state.
10. a kind of source of stable pressure (5), including：Generating circuit from reference voltage (51) and such as claim 1-9 any one of them are energy saving
Current-limiting circuit (3)；Wherein,
The energy saving current-limiting circuit (3), in output current (Iout) overcurrent, limiting the output current (Iout)
Stream；
The generating circuit from reference voltage (51), the control circuit for pulse-width modulation being connected in the energy saving current-limiting circuit (3)
(32), for generating current limliting reference voltage (Vref).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810104366.1A CN108227810A (en) | 2018-02-02 | 2018-02-02 | A kind of energy saving current-limiting circuit and the source of stable pressure with the energy saving current-limiting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810104366.1A CN108227810A (en) | 2018-02-02 | 2018-02-02 | A kind of energy saving current-limiting circuit and the source of stable pressure with the energy saving current-limiting circuit |
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| CN108227810A true CN108227810A (en) | 2018-06-29 |
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| CN201810104366.1A Pending CN108227810A (en) | 2018-02-02 | 2018-02-02 | A kind of energy saving current-limiting circuit and the source of stable pressure with the energy saving current-limiting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112267549A (en) * | 2020-10-10 | 2021-01-26 | 浙江飞创环境科技有限公司 | Integrated pump station |
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| CN102263505A (en) * | 2011-08-11 | 2011-11-30 | 无锡禾芯微电子有限公司 | Control circuit used for sharing inductance and current of DC-DC (Direct Current) converter |
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| CN112267549A (en) * | 2020-10-10 | 2021-01-26 | 浙江飞创环境科技有限公司 | Integrated pump station |
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Application publication date: 20180629 |