CN207924060U - A kind of contactor electricity-saving appliance detection circuit - Google Patents
A kind of contactor electricity-saving appliance detection circuit Download PDFInfo
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- CN207924060U CN207924060U CN201820242346.6U CN201820242346U CN207924060U CN 207924060 U CN207924060 U CN 207924060U CN 201820242346 U CN201820242346 U CN 201820242346U CN 207924060 U CN207924060 U CN 207924060U
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Abstract
The utility model discloses a kind of contactor electricity-saving appliance detection circuits, it is existing contactor electricity saver circuit is constituted with rectifier bridge and main power circuit on the basis of, it is further added by a rectification circuit, sample circuit and threshold value comparison circuit, there are benchmark one and benchmark two inside threshold value comparison circuit, when the output end signal crest voltage of sample circuit is more than benchmark for the moment, the main power circuit work is controlled, contactor is attracted；When the output end signal threshold voltage of sample circuit is less than benchmark two, control main power circuit is closed, contactor release；It is required that the output end signal voltage of sample circuit is equal when the output end signal crest voltage of sample circuit with input voltage is direct current when input voltage is exchange, so that the electrical voltage point of triggering contactor action is the same, realize that wide input voltage contactor is attracted in alternating current-direct current input voltage and release voltage point is all than more consistent purpose, and circuit is easy to use, to finally realize the general of AC/DC contactor electricity-saving appliance product, production and the warehousing pressure of manufacturer are reduced.
Description
Technical Field
The utility model relates to an ac contactor field, concretely relates to contactor electricity-saving appliance detection circuit.
Background
The traditional contactor operating system consists of a coil, a static iron core, an armature and a reaction spring. When the coil of the contactor is electrified, an attraction force is generated between the static iron core and the armature, when the attraction force is larger than the counterforce of the spring, the armature is attracted to the static iron core until the armature is contacted with the static iron core, the main contact is closed, and the process is called as an attraction process. The process that the coil is continuously electrified, the armature keeps contact with the static iron core, and the main contact keeps a closed state is called a holding process. When the current in the coil is reduced or interrupted, the attraction force of the static iron core to the armature is reduced, and when the attraction force is smaller than the reaction force of the spring, the armature returns to the open position, and the main contacts are separated, and the process is called a releasing process. From an electrical point of view, the contactor coil can be equivalent to an inductor with a certain internal resistance.
The input voltage range of the conventional contactor is narrow, and contactors with the same current capacity are divided into a plurality of specifications according to the operating voltage of the coil. Taking a commercially available CJ20 contactor as an example, the voltage specification of a general coil is shown in table 1. In order to accommodate different input voltages, multiple specifications of products are required.
TABLE 1 coil operating Voltage rating
| Coil operating voltage rating US | |
| AC input | 36VAC、127VAC、220VAC、380VAC |
| Direct current input | 48VDC、110VDC、220VDC |
Meanwhile, the working voltage range of the coil is narrower, the range of the general pull-in voltage is 85-110% US, and the release voltage is 20-75% US. From the data, the working range of the traditional contactor coil is narrow, and the specification is multiple.
The narrow working range of the traditional contactor is caused by the fact that the current of a coil of the contactor changes along with the input voltage, when the input voltage is high, the current is large, and the coil is easy to generate heat and damage; when the input voltage is low, the suction force is small, and the suction is unreliable. In recent years, contactor technology with PWM control has also become popular. By adopting the PWM control technology, the coil current can be constant in a wide range, and the width-to-voltage ratio (highest input voltage/lowest input voltage) can reach 9. As a simple example, the coil current can be constant in the range of 30V to 270V of input voltage as long as the coil is properly designed. Therefore, when some contactor factories are about to push out products with wide input range voltage, the voltage range of the normal work of the coil is 80-275V, the release voltage is 40-60V, and the input alternating current and direct current are required to be universal, and the pull-in threshold value and the release threshold value of the alternating current voltage and the direct current voltage are consistent. Similar to such wide input voltage contactor products, a voltage detection circuit is generally required to detect the input voltage and control the actuation and release of the contactor.
However, the ac and dc universal use has a problem. When the effective voltage is constant, the peak value of the ac/dc voltage is different, and for example, the peak value is 113V for an ac power having an effective value of 80V. Under the condition of alternating current and direct current, if simple voltage division sampling and threshold comparison are adopted, the alternating current input is triggered at lower voltage, and the action voltage of the alternating current input is inconsistent with that of the direct current input.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved in the present invention is to realize the consistency of the action voltage of the contactor under the condition of AC input and DC input.
In order to realize the purpose of the utility model, the technical scheme of the utility model is as follows:
a contactor electricity-saving appliance detection circuit comprises a first rectifier bridge and a main power circuit, and is used for controlling the current of a contactor coil; the method is characterized in that: the circuit also comprises a second rectifier bridge, a sampling circuit and a threshold comparison circuit; the AC input ends of the first rectifier bridge and the second rectifier bridge are connected in parallel and then connected with input voltage, the positive output end of the first rectifier bridge is connected with the main power circuit, the positive output end of the second rectifier bridge is connected with the input end of the sampling circuit, the negative output end of the first rectifier bridge is grounded with the negative output end of the second rectifier bridge, the output end of the sampling circuit is connected with the input end of the threshold comparison circuit, and the output end of the threshold comparison circuit is connected with the main power circuit; the threshold comparison circuit is internally provided with a first reference and a second reference, when the peak voltage of the signal at the output end of the sampling circuit is greater than the first reference, the threshold comparison circuit outputs a control signal to control the main power circuit to work, and the contactor is closed; when the valley voltage of the output end signal of the sampling circuit is smaller than the second reference, the threshold comparison circuit outputs a control signal to control the main power circuit to be closed, and the contactor is released; the peak voltage of the output end signal of the sampling circuit when the input voltage is alternating current is equal to the output end signal voltage of the sampling circuit when the input voltage is direct current.
As an improvement of the scheme, a voltage stabilizing diode can be connected in parallel with the output end of the sampling circuit, the cathode of the voltage stabilizing diode is connected with the output end of the sampling circuit, and the anode of the voltage stabilizing diode is grounded.
The first specific implementation mode of the sampling circuit is composed of a resistor R1, a resistor R2 and a capacitor C1, two end points of the resistor R1 and the resistor R2 after being connected in series form an input end of the sampling circuit, one end of the capacitor C1 is connected with a connection point of the resistor R1 and the resistor R2, and the other end of the capacitor C1 is grounded.
As an improvement of the first embodiment of the sampling circuit, the sampling circuit further comprises a zener diode Z1, wherein the zener diode Z1 is connected in parallel to two ends of the capacitor C1, a cathode of the zener diode Z1 is connected to a connection point of the resistor R1, the resistor R2 and the capacitor C1, and an anode of the zener diode Z1 is grounded.
The second specific implementation mode of the sampling circuit is composed of an inductor L1, a resistor R3 and a resistor R4, two end points of the inductor L1, the resistor R3 and the resistor R4 which are sequentially connected in series form an input end of the sampling circuit, and a connection point of the resistor R3 and the resistor R4 is an output end of the sampling circuit.
As an improvement of the second embodiment of the sampling circuit, the sampling circuit further comprises a zener diode Z1, the zener diode Z1 is connected in parallel to two ends of the resistor R4, wherein the cathode of the zener diode Z1 is connected to the connection point of the resistor R3 and the resistor R4, and the anode of the zener diode Z1 is grounded.
Another technical solution conceived by the same utility model of the present application is as follows:
a contactor electricity-saving appliance detection circuit comprises a first rectifier bridge and a main power circuit, and is used for controlling the current of a contactor coil; the method is characterized in that: the circuit also comprises a first diode, a second diode, a sampling circuit and a threshold comparison circuit; the input end of the first rectifier bridge is respectively connected with the anodes of the first diode and the second diode, the positive output end of the first rectifier bridge is connected with the main power circuit, the negative output end of the first rectifier bridge is grounded, the cathodes of the first diode and the second diode are connected and then grounded through the input end of the sampling circuit, the output end of the sampling circuit is connected with the input end of the threshold comparison circuit, and the output end of the threshold comparison circuit is connected with the main power circuit; the threshold comparison circuit is internally provided with a first reference and a second reference, when the peak voltage of the signal at the output end of the sampling circuit is greater than the first reference, the threshold comparison circuit outputs a control signal to control the main power circuit to work, and the contactor is closed; when the signal value voltage of the output end of the sampling circuit is smaller than the second reference, the threshold comparison circuit outputs a control signal to control the main power circuit to be closed, and the contactor is released; the peak voltage of the output end signal of the sampling circuit when the input voltage is alternating current is equal to the output end signal voltage of the sampling circuit when the input voltage is direct current.
As an improvement of the scheme, a voltage stabilizing diode can be connected in parallel at the output end of the sampling circuit, the cathode of the voltage stabilizing diode is connected with the output end of the sampling circuit, and the anode of the voltage stabilizing diode is grounded.
The first specific implementation mode of the sampling circuit is composed of a resistor R1, a resistor R2 and a capacitor C1, wherein the resistor R1 is connected with the resistor R2 in series, one end of the resistor R1 which is connected with the resistor R2 in series is connected with a cathode connection point of a first diode and a second diode, the other end of the resistor R1 which is connected with the resistor R2 in series is grounded, one end of the capacitor C1 is connected with a connection point of the resistor R1 and the resistor R2, and the other end of the capacitor C1 is grounded.
As an improvement of the first embodiment of the sampling circuit, the sampling circuit further comprises a zener diode Z1, wherein the zener diode Z1 is connected in parallel to two ends of the capacitor C1, a cathode of the zener diode Z1 is connected to a connection point of the resistor R1, the resistor R2 and the capacitor C1, and an anode of the zener diode Z1 is grounded.
The second specific implementation mode of the sampling circuit is composed of an inductor L1, a resistor R3 and a resistor R4, the cathode connection point of the first diode and the second diode is grounded after passing through the inductor L1, the resistor R3 and the resistor R4 in sequence, and the connection point of the resistor R3 and the resistor R4 is the output end of the sampling circuit.
As an improvement of the first embodiment of the sampling circuit, the sampling circuit further comprises a zener diode Z1, the zener diode Z1 is connected in parallel to two ends of the resistor R4, wherein the cathode of the zener diode Z1 is connected to the connection point of the resistor R3 and the resistor R4, and the anode of the zener diode Z1 is grounded.
The utility model discloses a theory of operation analysis as follows:
the output end signal of the sampling circuit is recorded as VT; the first internal reference of the threshold comparison circuit is recorded as VTH1, and the second internal reference is recorded as VTH 2.
When the peak voltage of the signal VT is larger than VTH1, the main power circuit is controlled to work, and the contactor is closed; when the valley voltage of the signal VT is less than VTH2, the main power circuit is controlled to close and the contactor is released.
The transfer function of the input and output of the sampling circuit is a function a (f) related to the frequency of the input signal. When the input voltage is direct current, the gain from the input to the output of the sampling circuit is marked as A (0). When the input voltage is a power frequency 50Hz signal, the frequency of the rectified voltage fundamental wave is 100Hz, the gain from the input to the output of the sampling circuit is marked as A (100),
the formula after rectification of the alternating-current input voltage is as follows:
wherein the UE is an input voltage effective value. Carrying out Fourier series expansion on VIN-AC (t), wherein harmonic components above 200Hz are very small, the components above 200Hz can be ignored, only harmonic components and direct current components of 100Hz are reserved, and the obtained formula is as follows:
after the rectified AC bus voltage passes through the sampling circuit, the voltage formula of the signal VT is as follows:
when ac is input, the peak voltage of signal VT is:
when a direct current is input, the voltage of the signal VT is:
VTDC＝UE·A(0)
the utility model has the advantages that: by selecting the parameters of the sampling circuit, set the appropriate A (0) and A (100) to let VTDC＝VTACThe voltage point of the trigger contactor is the same under the condition that the effective value of the voltage is the same under the condition of alternating current and direct current, the voltage point of the trigger contactor is the same, the purpose that the pull-in voltage point and the release voltage point of the wide input voltage contactor are consistent under the condition of alternating current and direct current input voltage is achieved, the circuit is simple and easy to use, the electricity saver of the alternating current and direct current contactor can be used generally, and the production and inventory pressure of manufacturers is reduced.
Meanwhile, after the Zener diode Z1 is added, the voltage of the signal VT can be limited, when the high voltage is input, the time for the voltage of the input power-down signal VT to fall to the undervoltage threshold point can be shorter, and the time delay of turn-off can be reduced.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic diagram of a first embodiment of the present invention;
fig. 3 is an equivalent circuit of a sampling circuit according to a first embodiment of the present invention;
fig. 4 is a waveform of the signal VT at different input voltages according to the first embodiment of the present invention;
FIG. 5 is a schematic diagram of a second embodiment of the present invention;
fig. 6 is a schematic diagram of a third embodiment of the present invention;
fig. 7 is a schematic diagram of a fourth embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic circuit diagram of the present invention, the inventive concept of the present application is that on the basis of the existing circuit of the contactor power saver which is formed by the rectifier bridge and the main power circuit, a rectifier circuit, a sampling circuit and a threshold comparison circuit are added, a first reference and a second reference are arranged in the threshold comparison circuit, when the peak voltage of the output end signal of the sampling circuit is greater than the first reference, the main power circuit is controlled to work, and the contactor is closed; when the signal value voltage of the output end of the sampling circuit is smaller than the second reference, the main power circuit is controlled to be closed, and the contactor is released; the peak voltage of the output end signal of the sampling circuit when the input voltage is alternating current is required to be equal to the voltage of the output end signal of the sampling circuit when the input voltage is direct current, so that the voltage points of the trigger contactor are the same, the aim that the pull-in and release voltage points of the wide input voltage contactor are consistent under the condition of alternating current and direct current input voltage is fulfilled, the circuit is simple and easy to use, the universality of an alternating current and direct current contactor product is finally fulfilled, and the production and inventory pressure of a manufacturer for producing the electricity saver is reduced.
In order to make the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
First embodiment
Fig. 2 is a schematic diagram of a first embodiment of the present invention, and the power saver of the general contactor includes a rectifier bridge DB1 and a main power circuit for controlling the current of the contactor coil. The embodiment further comprises a rectifier bridge DB2, a resistor R1, a resistor R2, a capacitor C1 and a threshold comparison circuit. The alternating current input ends AC of the rectifier bridge DB1 and the rectifier bridge DB2 are connected in parallel and then connected with input voltage, the positive output end VBUS1 of the rectifier bridge DB1 is connected with the main power circuit, and the negative output end of the rectifier bridge DB1 is connected with the ground. The positive output end VBUS2 of the rectifier bridge DB2 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, the connection point of the resistor R1 and the resistor R2 serves as an output end and is connected with the threshold comparison circuit, the other end of the resistor R2 is connected with the negative output end of the rectifier bridge DB2 and then is grounded, a capacitor C1 is connected with the two ends of the resistor R2 in parallel, and the threshold comparison circuit is connected with the main power circuit.
The embodiment further comprises a zener diode Z1, wherein the zener diode Z1 is connected in parallel to two ends of the capacitor C1, a cathode of the zener diode Z1 is connected to a connection point of the resistor R1, the resistor R2 and the capacitor C1, and an anode of the zener diode Z1 is grounded.
The voltage at the junction of the resistor R1 and the resistor R2 is recorded as the signal VT, and the threshold comparison circuit has references VTH1 and VTH2 therein. When the peak voltage of the signal VT is larger than VTH1, the main power circuit is controlled to work, and the contactor is closed; when the valley voltage of the signal VT is less than VTH2, the main power circuit is controlled to close and the contactor is released.
The operation of the present invention will be described below. The sampling circuit consisting of the resistor R1, the resistor R2 and the capacitor C1 can be simplified by thevenin's theorem, as shown in fig. 3. The equivalent relationship is as follows:
VBUS2 is a rectified bus voltage. The transfer function of the voltage divider circuit formed by RD and C1 is:
wherein,f is the frequency of the input signal.
When the input voltage is direct current, the gain of the sampling circuit is as follows:
AD(0)＝1
when the input voltage is a power frequency alternating current,
when the input is a dc voltage, the voltage of the signal VT is:
when the input is an alternating voltage, the voltage peak value of the signal VT is:
by appropriate values of the resistor R1, the resistor R2 and the capacitor C1, VT can be enabledDC＝VTACFinally, the trigger voltage is the same when the direct current input and the alternating current input are carried out, and the alternating current and direct current universal effect is achieved.
The practical effects of the present invention will be described with a specific set of data. Let the pull-in threshold compared with VT be 1.2V, the release threshold be 0.8V, R1 ═ 3M Ω, R2 ═ 50k Ω, C1 ═ 0.22uF, and the frequency f of the rectified bus voltage be 100 Hz. Substituting the above formula, the trigger voltage points of the dc input and the ac input can be obtained, as shown in table 2. It can be seen from the table that the ac/dc input condition meets the requirements of the new product at present. A more intuitive effect is shown in fig. 4, which shows the voltage value of the signal VT at different input voltages.
TABLE 2 adopt the utility model discloses, trigger point during AC/DC input
| AC input | Direct current input | |
| Pull-in voltage | 74VAC | 73VDC |
| Discharge voltage | 60VAC | 49VDC |
If the method of the present invention is not adopted, the bus voltage VBUS2 of the main power circuit is directly sampled, and the actual effect is shown in table 3. Because the bus voltage of the main power is directly sampled, the voltage amplitude of the bus voltage is related to the bus capacitor and the power consumption of the main power circuit and is an uncertain value, and the pull-in voltage point and the release voltage point of alternating current and direct current are greatly different.
TABLE 3 not adopted the utility model discloses, trigger point during AC/DC input
| AC input | Direct current input | |
| Pull-in voltage | 51VAC | 73VDC |
| Discharge voltage | Uncertainty | 49VDC |
Can know through the principle analysis above, the utility model discloses a circuit can be so that the actuation of alternating current-direct current and release voltage point all relatively more unanimous to the circuit is simple easy-to-use.
Second embodiment
Fig. 5 is a schematic diagram of a second embodiment of the present invention, which is different from the first embodiment in that the sampling circuit is composed of an inductor L1, a resistor R3 and a resistor R4, two end points of the inductor L1, the resistor R3 and the resistor R4 which are sequentially connected in series form an input end of the sampling circuit, and a connection point of the resistor R3 and the resistor R4 is an output end of the sampling circuit. The embodiment also further comprises a zener diode Z1, wherein the zener diode Z1 is connected in parallel to two ends of the resistor R4, a cathode of the zener diode Z1 is connected to a connection point of the resistor R3 and the resistor R4, and an anode of the zener diode Z1 is grounded.
The basic principle of the second embodiment is the same as that of the first embodiment, and the transfer function of the sampling circuit composed of the inductor L1, the resistor R3 and the resistor R4 is:
when the input voltage is direct current, the gain of the sampling circuit is as follows:
when the input voltage is power frequency alternating current, the gain of the sampling circuit is as follows:
the same effects as those of the embodiment can be obtained by selecting appropriate values of the inductor L1, the resistor R3, and the resistor R4.
Third embodiment
Fig. 6 is a schematic diagram of a third embodiment of the present invention, which is different from the first embodiment in that the rectifier bridge DB2 is replaced by a diode D1 and a diode D2, and the diode D1 and the diode D2 form a full-wave rectifier circuit with two diodes of the rectifier bridge DB1 connected to ground. The connection relationship is as follows: the anode of the diode D1 is connected to one end of the rectifier bridge DB1, and the anode of the diode D2 is connected to the other end of the rectifier bridge DB 1. The cathode of the diode D1 and the cathode of the diode D2 are connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, the connection point of the resistor R1 and the resistor R2 serves as an output end and is connected with a threshold comparison circuit, the other end of the resistor R2 is connected with the negative output end of the rectifier bridge DB2 and then is grounded, a capacitor C1 is connected with the two ends of the resistor R2 in parallel, and the threshold comparison circuit is connected with the main power circuit. The embodiment further comprises a zener diode Z1, wherein the zener diode Z1 is connected in parallel to two ends of the capacitor C1, a cathode of the zener diode Z1 is connected to a connection point of the resistor R1, the resistor R2 and the capacitor C1, and an anode of the zener diode Z1 is grounded.
Third, the principle of the embodiment is basically the same as the first embodiment. In the third embodiment, the diode D1, the diode D2, and two diodes of the rectifier bridge DB1, which are grounded, constitute the DB2 in the first embodiment. The other circuits are the same as those of the first embodiment.
Fourth embodiment
Fig. 7 is a schematic diagram of a fourth embodiment of the present invention, which is different from the second embodiment in that the rectifier bridge DB2 is replaced by a diode D1 and a diode D2, and the diode D1 and the diode D2 form a full-wave rectifier circuit with two diodes connected to ground in the rectifier bridge DB 1. The connection relationship is as follows: the anode of the diode D1 is connected with one end of the rectifier bridge DB1 alternating current input AC, the anode of the diode D2 is connected with the other end of the rectifier bridge DB1 alternating current input AC, the cathode of the diode D1 and the cathode of the diode D2 are connected with one end of the resistor R1,
the cathode connection point of the first diode and the second diode is grounded after sequentially passing through the inductor L1, the resistor R3 and the resistor R4, and the connection point of the resistor R3 and the resistor R4 is the output end of the sampling circuit. The embodiment further comprises a zener diode Z1, the zener diode Z1 is connected in parallel to two ends of the resistor R4, wherein the cathode of the zener diode Z1 is connected to the connection point of the resistor R3 and the resistor R4, and the anode of the zener diode Z1 is grounded.
The principle of the fourth embodiment is basically the same as the second embodiment. In the third embodiment, the diode D1, the diode D2, and two diodes of the rectifier bridge DB1, which are grounded, constitute the DB2 in the second embodiment. The other circuits are the same as those of the first embodiment.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (12)
1. A contactor electricity-saving appliance detection circuit comprises a first rectifier bridge and a main power circuit, and is used for controlling the current of a contactor coil; the method is characterized in that: the circuit also comprises a second rectifier bridge, a sampling circuit and a threshold comparison circuit; the AC input ends of the first rectifier bridge and the second rectifier bridge are connected in parallel and then connected with input voltage, the positive output end of the first rectifier bridge is connected with the main power circuit, the positive output end of the second rectifier bridge is connected with the input end of the sampling circuit, the negative output end of the first rectifier bridge is grounded with the negative output end of the second rectifier bridge, the output end of the sampling circuit is connected with the input end of the threshold comparison circuit, and the output end of the threshold comparison circuit is connected with the main power circuit; the threshold comparison circuit is internally provided with a first reference and a second reference, when the peak voltage of the signal at the output end of the sampling circuit is greater than the first reference, the threshold comparison circuit outputs a control signal to control the main power circuit to work, and the contactor is closed; when the valley voltage of the output end signal of the sampling circuit is smaller than the second reference, the threshold comparison circuit outputs a control signal to control the main power circuit to be closed, and the contactor is released; the peak voltage of the output end signal of the sampling circuit when the input voltage is alternating current is equal to the output end signal voltage of the sampling circuit when the input voltage is direct current.
2. The contactor power saver detection circuit of claim 1, wherein: the sampling circuit also comprises a voltage stabilizing diode, wherein the cathode of the voltage stabilizing diode is connected with the output end of the sampling circuit, and the anode of the voltage stabilizing diode is grounded.
3. The contactor power saver detection circuit of claim 1, wherein: the sampling circuit is composed of a resistor R1, a resistor R2 and a capacitor C1, two end points of the resistor R1 and the resistor R2 which are connected in series form an input end of the sampling circuit, one end of the capacitor C1 is connected with a connection point of the resistor R1 and the resistor R2, the other end of the capacitor C1 is grounded, and a connection point of the capacitor C1, the resistor R1 and the resistor R2 is an output end of the sampling circuit.
4. The contactor power saver detection circuit of claim 3, wherein: the sampling circuit further comprises a voltage stabilizing diode Z1, wherein a voltage stabilizing diode Z1 is connected in parallel with two ends of the capacitor C1, the cathode of the voltage stabilizing diode Z1 is connected with the connection point of the resistor R1, the resistor R2 and the capacitor C1, and the anode of the voltage stabilizing diode Z1 is grounded.
5. The contactor power saver detection circuit of claim 1, wherein: the sampling circuit consists of an inductor L1, a resistor R3 and a resistor R4, two end points of the inductor L1, the resistor R3 and the resistor R4 which are sequentially connected in series form the input end of the sampling circuit, and the connection point of the resistor R3 and the resistor R4 is the output end of the sampling circuit.
6. The contactor power saver detection circuit of claim 5, wherein: the sampling circuit further comprises a voltage stabilizing diode Z1, wherein the voltage stabilizing diode Z1 is connected in parallel with two ends of the resistor R4, the cathode of the voltage stabilizing diode Z1 is connected with the connection point of the resistor R3 and the resistor R4, and the anode of the voltage stabilizing diode Z1 is grounded.
7. A contactor electricity-saving appliance detection circuit comprises a first rectifier bridge and a main power circuit, and is used for controlling the current of a contactor coil; the method is characterized in that: the circuit also comprises a first diode, a second diode, a sampling circuit and a threshold comparison circuit; the input end of the first rectifier bridge is respectively connected with the anodes of the first diode and the second diode, the positive output end of the first rectifier bridge is connected with the main power circuit, the negative output end of the first rectifier bridge is grounded, the cathodes of the first diode and the second diode are connected and then grounded through the input end of the sampling circuit, the output end of the sampling circuit is connected with the input end of the threshold comparison circuit, and the output end of the threshold comparison circuit is connected with the main power circuit; the threshold comparison circuit is internally provided with a first reference and a second reference, when the peak voltage of the signal at the output end of the sampling circuit is greater than the first reference, the threshold comparison circuit outputs a control signal to control the main power circuit to work, and the contactor is closed; when the valley voltage of the output end signal of the sampling circuit is smaller than the second reference, the threshold comparison circuit outputs a control signal to control the main power circuit to be closed, and the contactor is released; the peak voltage of the output end signal of the sampling circuit when the input voltage is alternating current is equal to the output end signal voltage of the sampling circuit when the input voltage is direct current.
8. The contactor power saver detection circuit of claim 7, wherein: the sampling circuit also comprises a voltage stabilizing diode, wherein the cathode of the voltage stabilizing diode is connected with the output end of the sampling circuit, and the anode of the voltage stabilizing diode is grounded.
9. The contactor power saver detection circuit of claim 7, wherein: the sampling circuit is composed of a resistor R1, a resistor R2 and a capacitor C1, the resistor R1 is connected with the resistor R2 in series, one end of the resistor R1 is connected with the resistor R2 in series and then is connected with the cathode connection point of the first diode and the second diode, the other end of the resistor R1 is connected with the resistor R2 in series and then is grounded, one end of a capacitor C1 is connected with the connection point of the resistor R1 and the resistor R2, the other end of the capacitor C1 is grounded, and the connection point of the capacitor C1, the resistor R1 and the resistor R2 is the output end of the sampling circuit.
10. The contactor power saver detection circuit of claim 9, wherein: the sampling circuit further comprises a voltage stabilizing diode Z1, wherein a voltage stabilizing diode Z1 is connected in parallel with two ends of the capacitor C1, the cathode of the voltage stabilizing diode Z1 is connected with the connection point of the resistor R1, the resistor R2 and the capacitor C1, and the anode of the voltage stabilizing diode Z1 is grounded.
11. The contactor power saver detection circuit of claim 7, wherein: the sampling circuit consists of an inductor L1, a resistor R3 and a resistor R4, the cathode connection point of the first diode and the second diode is grounded after sequentially passing through the inductor L1, the resistor R3 and the resistor R4, and the connection point of the resistor R3 and the resistor R4 is the output end of the sampling circuit.
12. The contactor power saver detection circuit of claim 11, wherein: the sampling circuit further comprises a voltage stabilizing diode Z1, wherein the voltage stabilizing diode Z1 is connected in parallel with two ends of the resistor R4, the cathode of the voltage stabilizing diode Z1 is connected with the connection point of the resistor R3 and the resistor R4, and the anode of the voltage stabilizing diode Z1 is grounded.
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| CN201820242346.6U CN207924060U (en) | 2018-02-11 | 2018-02-11 | A kind of contactor electricity-saving appliance detection circuit |
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| CN201820242346.6U CN207924060U (en) | 2018-02-11 | 2018-02-11 | A kind of contactor electricity-saving appliance detection circuit |
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| CN207924060U true CN207924060U (en) | 2018-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019153834A1 (en) * | 2018-02-11 | 2019-08-15 | 广州金升阳科技有限公司 | Contactor energy saving test circuit |
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2018
- 2018-02-11 CN CN201820242346.6U patent/CN207924060U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019153834A1 (en) * | 2018-02-11 | 2019-08-15 | 广州金升阳科技有限公司 | Contactor energy saving test circuit |
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