CN209014636U - A kind of detection circuit and the contactor electricity-saving appliance comprising the detection circuit - Google Patents
A kind of detection circuit and the contactor electricity-saving appliance comprising the detection circuit Download PDFInfo
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- CN209014636U CN209014636U CN201821328185.9U CN201821328185U CN209014636U CN 209014636 U CN209014636 U CN 209014636U CN 201821328185 U CN201821328185 U CN 201821328185U CN 209014636 U CN209014636 U CN 209014636U
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Abstract
A kind of contactor electricity-saving appliance the utility model discloses detection circuit and comprising the detection circuit, the detection circuit of the utility model increases clamp circuit on the basis of existing technology, the voltage for comparing output circuit input terminal is limited in some setting value by clamp circuit, so that when turning off contactor, when cutting off the busbar voltage of detection circuit input port input, the voltage for comparing output circuit input terminal drops to time of activation threshold value and becomes faster, the time that detection circuit output port output control signal control contactor electricity-saving appliance is closed shortens, so that the shutdown delay in the occasion contactor of high input voltage is controlled, make the shutdown delay of contactor in the case of high low pressure input voltage more consistent simultaneously.
Description
Technical field
The utility model relates to contactor electricity-saving appliance fields, in particular to the input voltage measurement electricity of contactor electricity-saving appliance
Road.
Background technique
With the rapid development of electronic technology, the application of contactor electricity-saving appliance is also more and more extensive.Contactor electricity-saving appliance can
To reduce the loss of contactor significantly, but also bring another question.After contactor electricity-saving appliance, contactor shutdown
Delay can be elongated.It is usually 50ms or so without the contactor shutdown delay of electricity-saving appliance, and the shutdown of the contactor with electricity-saving appliance
Delay is greater than 100ms, or even can be more than 200ms.Contactor shutdown delay without electricity-saving appliance is primarily due to machinery inertial and leads
It causes, and the contactor with electricity-saving appliance is other than machinery inertial, excessively slow and input voltage measurement the delay of coil current decays
It is two chief reasons.
Using the contactor of electricity-saving appliance, coil current is no longer determined by the impedance of coil, but is controlled by control chip
Coil current processed, the working range of coil can become very wide.It is possible that nominal input voltage 20% or less contactor also
It not will disconnect, this does not just meet the release voltage standard of contactor.Therefore general electricity-saving appliance can all have an input voltage measurement
Function, usually detecting electricity is a bleeder circuit, by compared with baseline threshold, to judge connection and the pass of control contactor
It is disconnected.Alternating current-direct current inputs general contactor, also has filter circuit other than partial pressure, for filter out the ripple of input voltage with
Interference.And the presence of filter circuit will lead to detection circuit and have certain delay, so that the shutdown of contactor is delayed and increases,
Especially when input voltage is higher, the delay of detection is bigger.It is unfavorable for the popularization of electricity-saving appliance.
Utility model content
Have in view of that, the technical problem to be solved by the present invention is to provide a kind of detection circuit and includes the detection circuit
Contactor electricity-saving appliance, can reduce the contactor with electricity-saving appliance shutdown delay.
The technical solution that the utility model solves above-mentioned technical problem is:
A kind of detection circuit is used for contactor electricity-saving appliance, comprising: sample circuit, filter circuit compare output circuit, are defeated
Inbound port and output port；
The input terminal of sample circuit is input port, and the input of output circuit is compared in the output end connection of sample circuit
End, the output end for comparing output circuit is output port, and filter circuit is parallel to the ground terminal and sample circuit of sample circuit
Output end between；
Sample circuit generates sampled signal and exports to comparing output circuit for acquiring busbar voltage；Compare output electricity
Sampled signal is compared by road with reference signal, exports control signal by output port；Filter circuit is for filtering out sampling
The ripple of signal and interference；
It is characterized by also including clamp circuit, the ground terminal of the input terminal connection sample circuit of clamp circuit, clamper electricity
The input terminal of output circuit is compared in the output end connection on road, and clamp circuit is used to sampled signal being limited to setting value.
A kind of specific embodiment as sample circuit, it is characterised in that: including two concatenated resistance, after series connection
One end be sample circuit input terminal, the other end ground connection after series connection, the tie point of two resistance is the output of sample circuit
End.
A kind of specific embodiment as filter circuit, it is characterised in that: including a capacitor.
As a kind of specific embodiment for comparing output circuit, it is characterised in that: including a hysteresis comparator, late
The noninverting input input reference signal of stagnant comparator, the reverse input end of hysteresis comparator are the input for comparing output circuit
End, the output end of hysteresis comparator is the output end for comparing output circuit.
A kind of specific embodiment as clamp circuit, it is characterised in that: including a zener diode, pressure stabilizing two
The anode of pole pipe is the input terminal of clamp circuit, and the cathode of zener diode is the output end of clamp circuit.
Another specific embodiment as clamp circuit, it is characterised in that: including the first N-channel MOS pipe,
Two N-channel MOS pipes, the first P-channel metal-oxide-semiconductor and the second P-channel metal-oxide-semiconductor；The source electrode and the second N-channel of first N-channel MOS pipe
The input terminal of clamp circuit, the grid of the grid of the first N-channel MOS pipe, the second N-channel MOS pipe are formed after the source electrode connection of metal-oxide-semiconductor
The drain electrode of pole and the second P-channel metal-oxide-semiconductor connects, and the source electrode of the second P-channel metal-oxide-semiconductor is the output end of clamp circuit, the first P-channel
The drain electrode of the grid of metal-oxide-semiconductor, the grid of the second P-channel metal-oxide-semiconductor and the first N-channel MOS pipe connects, the source of the first P-channel metal-oxide-semiconductor
Pole is for connecting clamper reference voltage.
Preferably, by another specific embodiment of said clamping circuit, output circuit is integrated to chip compared with
In.
As a kind of specific embodiment of detection circuit, including resistance R1, resistance R2, capacitor C1, hysteresis comparator
U1 and zener diode Z1；One end of resistance R1 is the one of the input port of detection circuit, the other end of resistance R1 and resistance R2
End is connected, and the other end ground connection of resistance R2, capacitor C1 is parallel to the both ends resistance R2；The plus earth of zener diode Z1, pressure stabilizing
The negative input end of the cathode connection hysteresis comparator U1 of diode Z1；The tie point and sluggishness of resistance R1, resistance R2 and capacitor C1
The negative input end of comparator U1 is connected, and the positive input terminal of hysteresis comparator U1 is used for input reference signal；Hysteresis comparator U1's
Output end is the output port of detection circuit.
Accordingly, the utility model also provides the contactor electricity-saving appliance comprising above-mentioned detection circuit, when sampled signal is higher than
When reference signal, the control signal control contactor electricity-saving appliance work of detection circuit output port output；When sampled signal is lower than
When reference signal, the control signal control contactor electricity-saving appliance of detection circuit output port output is closed.
Term is explained:
Clamper reference voltage: the voltage value and setting value of clamper reference voltage (refer in the 6th section of utility model content
" setting value ") it is identical, refer to and be locked when voltage is raised or lowered to some value, the voltage risen or fallen cannot be continued
Value.
The utility model by increase clamp circuit, clamp circuit be parallel to sample circuit output end and ground terminal it
Between, the voltage for the input terminal for comparing output circuit is limited in some setting value, it is more defeated for being prevented in the case where high low pressure inputs
The overtension of the input terminal of circuit, deviation are excessive out, so that the shutdown delay of contactor is controlled.
For the specific embodiment of above-mentioned detection circuit, the effect of the utility model is illustrated by an actual example
Fruit.Input voltage lower limit value takes VININ=80V, input voltage ceiling value VINAX=275V, R1=1500k Ω, R2=150k
Ω, C1=0.1uF, clamp voltage 2.5V, VREF=1V.Hysteresis comparator U1 negative input in available Fig. 2 turn off process
The voltage attenuation timing diagram at end.The attenuation curve that curve 1 is prescribed a time limit in figure for no clamp circuit input voltage height, curve 2 is no pincers
The attenuation curve of position circuit input voltage lower limit value, curve 3 are the attenuation curve added after clamp circuit.Not plus when clamp circuit,
Input voltage is that high detection delay of prescribing a time limit is 44ms, and detection delay is 27ms when input voltage is lower bound.After adding clamp circuit, nothing
By input high low pressure, voltage is clamped at 2.5V, detection delay 17ms.Compared to not plus clamp circuit, when high low pressure, is detected
Delay has respectively reduced 10ms and 27ms, so that shutdown delay further reduces, the shutdown close to traditional contactors is delayed.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model；
Fig. 2 is the displaying of the utility model actual effect；
Fig. 3 is the first embodiment schematic diagram of the utility model；
Fig. 4 is the second embodiment schematic diagram of the utility model.
Specific embodiment
Fig. 1 show the schematic block circuit diagram of the utility model, and the utility model of the application is contemplated that in sample circuit
Ground terminal increases clamp circuit between the input terminal of output circuit compared with, compares output circuit input terminal by clamp circuit handle
Voltage be limited in some setting value so that when turning off contactor, i.e. the bus electricity of cutting sample circuit input port input
When pressure, the voltage for comparing output circuit input terminal drops to time of activation threshold value and becomes faster, the output control of detection circuit output port
The time that signal control contactor electricity-saving appliance processed is closed shortens, so that the shutdown delay in the occasion contactor of high input voltage is able to
Control, while making the shutdown delay of contactor in the case of high low pressure input voltage more consistent.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
The utility model is further described in example.
First embodiment
The utility model first embodiment is as shown in Figure 3.Input voltage VIN is connected with one end of resistance R1, resistance R1
The other end is connected with resistance R2, the other end ground connection of resistance R2, capacitor C1 parallel connection and the both ends resistance R2.Resistance R1, resistance R2 with
The tie point of capacitor C1 is connected with the negative input end of hysteresis comparator U1, the positive input terminal and reference threshold of hysteresis comparator U1
VREF is connected.The output end output signal CTRL of hysteresis comparator U1, the driving circuit of control starting and shutdown contactor.In order to
Achieve the purpose that reduce contactor shutdown, also includes clamp circuit, in the present embodiment, clamp circuit is zener diode Z1,
The cathode of zener diode is connected with the tie point of resistance R1, R2 and capacitor C1, the plus earth of zener diode.
The working principle of the present embodiment are as follows: when cutting off input voltage VIN, since the voltage at the both ends capacitor C1 will not dash forward
Become, the voltage that will lead to hysteresis comparator U1 negative input end declines very slow, and input voltage VIN is higher, and hysteresis comparator U1 is negative
The time that the voltage of input terminal drops to activation threshold value is longer, and shutdown delay is inconsistent when high low pressure being caused to input, and in height
Shutdown delay significantly becomes larger when input voltage.The present embodiment is worth the zener diode of a little higher than reference threshold VREF using pressure stabilizing
Z1, the voltage clamping of hysteresis comparator U1 negative input end in the slightly above voltage value of VREF.So in cutting input voltage VIN
When, the time that the voltage of hysteresis comparator U1 negative input end drops to activation threshold value will become faster, while high low pressure is inputted
Under voltage, shutdown delay also can be than more consistent.
Second embodiment
As shown in figure 4, being different from the first embodiment in clamp circuit difference, this is implemented second embodiment schematic diagram
The clamp circuit of example is by the first N-channel MOS pipe, the second N-channel MOS pipe, the first P-channel metal-oxide-semiconductor and the second P-channel metal-oxide-semiconductor group
At clamp circuit can be accomplished to control to be gone inside chip, the volume and cost of complete machine can be further decreased, such as the void in Fig. 4
Frame portion is the circuit of chip interior.
For the present embodiment in order to achieve the purpose that reduce contactor shutdown, the clamp circuit added includes N-MOS pipe N1, N2,
P-MOS pipe P1, P2.The source electrode of the P1 of P-MOS is connect with clamper setting voltage VCLAMP, the grid of P1 and the grid of drain electrode and P2
The drain electrode connection of pole, N1, the source electrode of P2 are connected with the negative input end of hysteresis comparator U1, the drain electrode of P2 and the grid of N1, N2's
Grid and drain electrode connection, the source electrode of N1, N2 are connect with reference.The substrate of all P-MOS and N-MOS pipes all with respective source
Pole connection.
The effect of clamp circuit in second embodiment and first embodiment clamp circuit be it is the same, be provided to late
The voltage of stagnant comparator U1 negative input end is limited in a relatively low voltage value.Only realize that the principle of clamper is different.
In order to facilitate the clamper principle for describing this circuit, the breadth length ratio of N1, N2 are identical, and the breadth length ratio of P1 and P2 is identical, N1,
N2 constitutes well known current-mirror structure, therefore can be obtained by well known current mirror working principle, when the work of above-mentioned 2 NOS pipes exists
When saturation region, if ignoring channel-length modulation, drain current is equal, i.e. IDN1=IDN2.Again because of P1 and N1, P2
It connects respectively with the channel of N2, so P1 and N1, P2 are equal with the drain current of N2 difference.In conclusion all metal-oxide-semiconductors all
Work has I at saturation regionDP1=IDN1=IDN2=IDP2, IDP1And IDP2It is the drain current of P1 and P2 respectively.
By well known POS pipe saturation region drain current formula
Wherein KpIt is constant related with semiconductor technology, Wp/LpIt is the breadth length ratio of POS pipe, VGSPIt is the grid source electricity of POS pipe
Pressure, VTHPIt is the threshold voltage of POS pipe.
In conclusion the breadth length ratio of P1 and P2 is identical, type of device is identical, i.e. Kp1=Kp2=Kp, Wp1/Lp1=Wp2/Lp2,
VTHP1=VTHP2=VTHP.I is integrated againDP1=IDP2With formula (1), there is following relationship:
VGSP1=VGSP2
VGP1-VSP1=VGP2-VSP2
Again because P1 is connected with the grid of P2, i.e. VGP1=VGP2, therefore have VSP1=VSP2, i.e. V1=VCLAMP can handle
The voltage clamping of hysteresis comparator negative input end is VCLAMP.
The above is the preferred embodiment of the utility model, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of this utility model, several improvements and modifications made also should be regarded as the utility model
Protection scope.
Claims (9)
1. a kind of detection circuit is used for contactor electricity-saving appliance, comprising: sample circuit, filter circuit compare output circuit, input
Port and output port；
The input terminal of sample circuit is input port, and the input terminal of output circuit is compared in the output end connection of sample circuit, than
Output end compared with output circuit is output port, and filter circuit is parallel to the output of the ground terminal and sample circuit of sample circuit
Between end；
Sample circuit generates sampled signal and exports to comparing output circuit for acquiring busbar voltage；Comparing output circuit will
Sampled signal is compared with reference signal, exports control signal by output port；Filter circuit is for filtering out sampled signal
Ripple and interference；
It is characterized by also including clamp circuit, the input terminal of clamp circuit connects the ground terminal of sample circuit, clamp circuit
Output end connects the input terminal for comparing output circuit, and clamp circuit is used to sampled signal being limited to setting value.
2. detection circuit according to claim 1, it is characterised in that: sample circuit includes two concatenated resistance, series connection
One end afterwards is the input terminal of sample circuit, and the other end ground connection after series connection, the tie point of two resistance is the defeated of sample circuit
Outlet.
3. detection circuit according to claim 1, it is characterised in that: filter circuit includes a capacitor.
4. detection circuit according to claim 1, it is characterised in that: compare as output circuit is compared including a sluggishness
Device, the noninverting input input reference signal of hysteresis comparator, the reverse input end of hysteresis comparator is to compare output circuit
Input terminal, the output end of hysteresis comparator are the output end for comparing output circuit.
5. detection circuit according to claim 1, it is characterised in that: clamp circuit includes a zener diode, pressure stabilizing
The anode of diode is the input terminal of clamp circuit, and the cathode of zener diode is the output end of clamp circuit.
6. detection circuit according to claim 1, it is characterised in that: clamp circuit includes: the first N-channel MOS pipe, second
N-channel MOS pipe, the first P-channel metal-oxide-semiconductor and the second P-channel metal-oxide-semiconductor；The source electrode and the second N-channel MOS of first N-channel MOS pipe
The input terminal of clamp circuit, the grid of the grid of the first N-channel MOS pipe, the second N-channel MOS pipe are formed after the source electrode connection of pipe
Drain electrode with the second P-channel metal-oxide-semiconductor connects, and the source electrode of the second P-channel metal-oxide-semiconductor is the output end of clamp circuit, the first P-channel MOS
The drain electrode of the grid of pipe, the grid of the second P-channel metal-oxide-semiconductor and the first N-channel MOS pipe connects, the source electrode of the first P-channel metal-oxide-semiconductor
For connecting clamper reference voltage.
7. detection circuit according to claim 6, it is characterised in that: by said clamping circuit, output circuit is integrated compared with
Into chip.
8. detection circuit according to claim 1, it is characterised in that: detection circuit includes: resistance R1, resistance R2, capacitor
C1, hysteresis comparator U1 and zener diode Z1；One end of resistance R1 is the other end of the input port of detection circuit, resistance R1
It is connected with one end of resistance R2, the other end ground connection of resistance R2, capacitor C1 is parallel to the both ends resistance R2；The sun of zener diode Z1
Pole ground connection, the negative input end of the cathode connection hysteresis comparator U1 of zener diode Z1；The company of resistance R1, resistance R2 and capacitor C1
Contact is connected with the negative input end of hysteresis comparator U1, and the positive input terminal of hysteresis comparator U1 is used for input reference signal；It is sluggish
The output end of comparator U1 is the output port of detection circuit.
9. a kind of contactor electricity-saving appliance comprising any one of claim 1 to 8 detection circuit, it is characterised in that: work as sampled signal
When higher than reference signal, the control signal control contactor electricity-saving appliance work of detection circuit output port output；Work as sampled signal
When lower than reference signal, the control signal control contactor electricity-saving appliance of detection circuit output port output is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821328185.9U CN209014636U (en) | 2018-08-17 | 2018-08-17 | A kind of detection circuit and the contactor electricity-saving appliance comprising the detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821328185.9U CN209014636U (en) | 2018-08-17 | 2018-08-17 | A kind of detection circuit and the contactor electricity-saving appliance comprising the detection circuit |
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|---|---|
| CN209014636U true CN209014636U (en) | 2019-06-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828296A (en) * | 2018-08-17 | 2018-11-16 | 深圳南云微电子有限公司 | A kind of detection circuit and the contactor electricity-saving appliance comprising the detection circuit |
| CN110531219A (en) * | 2019-09-05 | 2019-12-03 | 上海芯荃微电子科技有限公司 | A kind of exchange detection method and circuit using switch drain |
-
2018
- 2018-08-17 CN CN201821328185.9U patent/CN209014636U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108828296A (en) * | 2018-08-17 | 2018-11-16 | 深圳南云微电子有限公司 | A kind of detection circuit and the contactor electricity-saving appliance comprising the detection circuit |
| CN110531219A (en) * | 2019-09-05 | 2019-12-03 | 上海芯荃微电子科技有限公司 | A kind of exchange detection method and circuit using switch drain |
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