CN208188220U - A kind of novel load detection circuit - Google Patents
A kind of novel load detection circuit Download PDFInfo
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- CN208188220U CN208188220U CN201820378852.8U CN201820378852U CN208188220U CN 208188220 U CN208188220 U CN 208188220U CN 201820378852 U CN201820378852 U CN 201820378852U CN 208188220 U CN208188220 U CN 208188220U
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Abstract
The utility model discloses a kind of novel load detection circuits, including the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor and the second metal-oxide-semiconductor is connected separately with output enable signal A and output enable signal B, first diode is integrated between source electrode and drain electrode inside first metal-oxide-semiconductor, the second diode is integrated between the source electrode and drain electrode of second metal-oxide-semiconductor, the output enable signal end of first metal-oxide-semiconductor is connected with the first shunt resistance, the output enable signal end of second metal-oxide-semiconductor is connected with the second shunt resistance, the source electrode of second metal-oxide-semiconductor is connected with signal amplifier, the output end of the signal amplifier is connected with data acquisition signal line, it is sampled by using the internal resistance of metal-oxide-semiconductor, sampling internal resistance in this way becomes larger, output electric current can be carried out well again Sampling, as long as and there is the electric current of very little to flow through metal-oxide-semiconductor, metal-oxide-semiconductor both ends can all generate higher pressure drop, and so as to accurately judge whether there is load, decision circuitry is simple.
Description
Technical field
The utility model relates to detection circuit field, specially a kind of novel load detection circuit.
Background technique
Although there are many kinds of type, bases for the switch of power supply output control circuit that current belt switch and anti-electric current flow backward
It is all that can be closed in the case where the exceptions such as shutdown or output overcurrent, short circuit by metal-oxide-semiconductor Q1, Q2 in circuit in sheet, with
The output of this power cutoff, there is also following shortcomings in switch over-loading control circuit:
For example, patent name is that a kind of M-bus communicates the practical of overload detection circuit application No. is 201620043810.X
New patent:
It judges the overload situations of M-bus bus by using the mode of detection M-bus bus current signal, effectively keeps away
Exempt to judge problem by accident caused by the floating of M-bus bus voltage is excessive；Reference voltage is adjusted using reference voltage regulating circuit, it can
Reference voltage adjustment is carried out according to the concrete condition of M-bus bus and circuit characteristic demand, versatility is good；Using dedicated comparator
The comparison of circuit voltage is carried out, small power consumption effectively prevent the damage of device.
But existing novel load detection circuit has the following deficiencies:
(1) by detection output electric current to determine whether there is load, this is needed in circuit loop existing detection control circuit
As soon as middle increase an inspection leakage resistance R1 to do current sample, but this is more troublesome in High-current output, if selected biggish
Current sampling resistor is that detection when can guarantee low current very well is accurate, but resistance loss is too big when high current；If choosing compared with
Small sampling resistor, although being lost small under high current, since pressure drop is inadequate in the case of low current, ADC sampled value is too low
And it can not reliably detect；
(2) and this output circuit is needed whether to have load to output port again and be detected, load detecting circuit
It loads and inaccurate, it is not very practical.
Summary of the invention
In order to overcome the shortcomings of prior art, the utility model provides a kind of novel load detection circuit, can be effective
Solve the problems, such as background technique propose.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
A kind of novel load detection circuit, including the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, first metal-oxide-semiconductor and the 2nd MOS
The grid of pipe is connected separately with output enable signal A and exports enable signal B, in source electrode and drain electrode inside first metal-oxide-semiconductor
Between be integrated with first diode, be integrated with the second diode between the source electrode and drain electrode of second metal-oxide-semiconductor, described first
The output enable signal end of metal-oxide-semiconductor is connected with the first shunt resistance, and the output enable signal end of second metal-oxide-semiconductor is connected with
Two shunt resistances between first shunt resistance and the other end of the second shunt resistance and connect power supply, second metal-oxide-semiconductor
Source electrode be connected with signal amplifier, the source electrode of second metal-oxide-semiconductor is also connected with output signal line, the signal amplifier
Reverse side is connected with power supply, and the output end of the signal amplifier is connected with data acquisition signal line.
Further, the signal end of the output enable signal A and output enable signal B are respectively connected with the touching of the first relay
The conduction terminal of point, first relay contact is connected with delay control circuit A.
Further, the data acquisition signal line bus end is also connected with delay control circuit B, the delays time to control electricity
Road B is connected with load by the second relay contact, the both ends of the load and road time-delay relay when being connected to.
Further, the branch road of road time-delay relay is serially connected with third relay contact when described.
Further, the bus branch of the load is connected with output enable signal.
Further, road time-delay relay and third relay contact joining branch road are gone back and are connected to divider resistance when described
And light emitting diode, it is connected in series between the divider resistance and light emitting diode.
Compared with prior art, the utility model has the beneficial effects that
(1) load detecting circuit of the utility model is sampled by using the internal resistance of metal-oxide-semiconductor, samples interior resistive in this way
Greatly, but can well to output electric current sample, as long as and there is the electric current of very little to flow through metal-oxide-semiconductor, metal-oxide-semiconductor both ends can all produce
Raw higher pressure drop, so as to accurately judge whether there is load, decision circuitry is simple；
(2) load detecting circuit of the utility model can construct integrated circuit figure, apply in various power supply switch circuits
In, it can be good at the precision of detection circuit using delay circuit, improve the stability of circuit.
Detailed description of the invention
Fig. 1 is the load detecting circuit figure of the utility model；
Fig. 2 is the integrated circuit figure of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As depicted in figs. 1 and 2, the utility model provides a kind of novel load detection circuit, including the first metal-oxide-semiconductor Q1 and
The grid of second metal-oxide-semiconductor Q2, the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 is connected separately with output enable signal A-OUT_EN1
First diode is integrated between source electrode and drain electrode with inside output enable signal B-OUT_EN2, the first metal-oxide-semiconductor Q1
D1 is integrated with the second diode D2 between the source electrode and drain electrode of the second metal-oxide-semiconductor Q2, and the output of the first metal-oxide-semiconductor Q1 makes
Energy signal end is connected with the first shunt resistance R1, and the output enable signal end of the second metal-oxide-semiconductor Q2 is connected with the second shunting electricity
R2 is hindered, between the first shunt resistance R1 and the other end of the second shunt resistance R2 and meets power supply VCC, the 2nd MOS
The source electrode of pipe Q2 is connected with signal amplifier S, and the source electrode of the second metal-oxide-semiconductor Q2 is also connected with output signal line OUTPUT, institute
The reverse side for stating signal amplifier S is connected with power supply VCC, and the output end of the signal amplifier S is connected with data acquisition signal
Line ADC_In.
It in the present embodiment, is sampled using the internal resistance of metal-oxide-semiconductor, when output electric current is enough big, for example output electric current is greater than 2A
When, the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 are switched on, at this time internal resistance very little, when electric current is small to be sampled near lower limit value to ADC,
Circuit is difficult accurately to detect load, closes the first metal-oxide-semiconductor Q1 at this time, and sampling internal resistance in this way becomes larger, and can be well to output
Electric current is sampled, and after being closed due to the first metal-oxide-semiconductor Q1, output circuit is indeed through two poles inside the first metal-oxide-semiconductor Q1
Pipe output, as long as there is the electric current of very little to flow through metal-oxide-semiconductor at this time, metal-oxide-semiconductor both ends can all generate higher pressure drop, to accurately sentence
It is disconnected whether to have load.
The output enable signal A-OUT_EN1 and the signal end for exporting enable signal B-OUT_EN2 are respectively connected with first
Relay contact KA1, the conduction terminal of the first relay contact KA1 are connected with delay control circuit A-FU1, and the data are adopted
Collection signal wire ADC_in bus end is also connected with delay control circuit B-FU2, the delay control circuit B-FU2 by second after
Appliance contact KA2 is connected with load F, the both ends of the load F and road time-delay relay L when being connected to, and road is delayed relay when described
The branch road of device L is serially connected with third relay contact KA3, bus branch and the output enable signal OUT_EN phase of the load F
Connection, road time-delay relay L and third relay contact KA3 concatenation branch road is gone back and is connected to divider resistance R3 and shines when described
Diode D3, is connected in series between the divider resistance R3 and light emitting diode D3.
In the present embodiment, whole power circuit is turned on the power switch when opening, when road time-delay relay L inside line
Circle obtains electric actuation by the normally-closed contact of third relay contact KA3, and the second relay contact KA2 opened point is attracted, and completes certainly
Lock loads F work once electrified, while the first relay contact KA1 is also attracted, for circuit function conversion preparation.
In the present embodiment, whole power circuit during shutdown, is turned off the power switch, certainly due to the second relay contact KA2
Power supply is sent to delay control circuit by the first contact relay contact KA1 of actuation so that load F works on by lock
FU1, when delay circuit reaches setting time point, delay circuit relay KA1 is attracted, and third relay contact KA3 is disconnected, and is prolonged
When circuit relay KA1 Inside coil discharge, the second contact relay contact KA2 disconnect, then load F and indicating circuit diode
(D3) it stops working, the first contact relay contact KA1 simultaneously switches off, and circuit power loss resets, to complete a duty cycle.
In the present embodiment, delay control circuit FU powers using DC power supply, and integrated three ends can be utilized in design
Voltage regulator circuit power supply, it is simple and convenient
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting
Related claim.
Claims (6)
1. a kind of novel load detection circuit, including the first metal-oxide-semiconductor (Q1) and the second metal-oxide-semiconductor (Q2), it is characterised in that: described
The grid of one metal-oxide-semiconductor (Q1) and the second metal-oxide-semiconductor (Q2) is connected separately with output enable signal A (OUT_EN1) and the enabled letter of output
Number B (OUT_EN2) is integrated with first diode (D1) inside first metal-oxide-semiconductor (Q1) between source electrode and drain electrode, and described the
It is integrated between the source electrode and drain electrode of two metal-oxide-semiconductors (Q2) the second diode (D2), the enabled letter of the output of first metal-oxide-semiconductor (Q1)
Number end is connected with the first shunt resistance (R1), and the output enable signal end of second metal-oxide-semiconductor (Q2) is connected with the second shunting electricity
It hinders (R2), between first shunt resistance (R1) and the other end of the second shunt resistance (R2) and connects power supply (VCC), it is described
The source electrode of second metal-oxide-semiconductor (Q2) is connected with signal amplifier (S), and the source electrode of second metal-oxide-semiconductor (Q2) is also connected with output letter
Number line (OUTPUT), the reverse side of the signal amplifier (S) are connected with power supply (VCC), the output of the signal amplifier (S)
End is connected with data acquisition signal line (ADC_In).
2. a kind of novel load detection circuit according to claim 1, it is characterised in that: the output enable signal A
(OUT_EN1) it is respectively connected with the first relay contact (KA1) with the signal end of output enable signal B (OUT_EN2), described first
The conduction terminal of relay contact (KA1) is connected with delay control circuit A (FU1).
3. a kind of novel load detection circuit according to claim 1, it is characterised in that: the data acquisition signal line
(ADC_in) bus end is also connected with delay control circuit B (FU2), and the delay control circuit B (FU2) passes through the second relay
Contact (KA2) is connected with load (F), the both ends of the load (F) and road time-delay relay (L) when being connected to.
4. a kind of novel load detection circuit according to claim 3, it is characterised in that: road time-delay relay when described
(L) branch road is serially connected with third relay contact (KA3).
5. a kind of novel load detection circuit according to claim 3, it is characterised in that: the bus branch of the load (F)
Road is connected with output enable signal (OUT_EN).
6. a kind of novel load detection circuit according to claim 4, it is characterised in that: road time-delay relay when described
(L) it concatenates branch road with third relay contact (KA3) also and is connected to divider resistance (R3) and light emitting diode (D3), described point
It is connected in series between piezoresistance (R3) and light emitting diode (D3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820378852.8U CN208188220U (en) | 2018-03-20 | 2018-03-20 | A kind of novel load detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820378852.8U CN208188220U (en) | 2018-03-20 | 2018-03-20 | A kind of novel load detection circuit |
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| Publication Number | Publication Date |
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| CN208188220U true CN208188220U (en) | 2018-12-04 |
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| CN201820378852.8U Active CN208188220U (en) | 2018-03-20 | 2018-03-20 | A kind of novel load detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021026866A1 (en) * | 2019-08-15 | 2021-02-18 | Tridonic Gmbh & Co Kg | Output load identification method and the apparatus incorporating the same |
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2018
- 2018-03-20 CN CN201820378852.8U patent/CN208188220U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021026866A1 (en) * | 2019-08-15 | 2021-02-18 | Tridonic Gmbh & Co Kg | Output load identification method and the apparatus incorporating the same |
| CN113994295A (en) * | 2019-08-15 | 2022-01-28 | 赤多尼科两合股份有限公司 | Output load identification method and apparatus incorporating the same |
| CN113994295B (en) * | 2019-08-15 | 2023-06-02 | 赤多尼科两合股份有限公司 | Output load identification method and apparatus incorporating the same |
| US11940856B2 (en) | 2019-08-15 | 2024-03-26 | Tridonic Gmbh & Co Kg | Output load identification method and the apparatus incorporating the same |
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