CN108387810B - Contactor electricity-saving appliance detection circuit - Google Patents
Contactor electricity-saving appliance detection circuit Download PDFInfo
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- CN108387810B CN108387810B CN201810139788.2A CN201810139788A CN108387810B CN 108387810 B CN108387810 B CN 108387810B CN 201810139788 A CN201810139788 A CN 201810139788A CN 108387810 B CN108387810 B CN 108387810B
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 95
- 239000003990 capacitor Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
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- 230000003068 static effect Effects 0.000 description 5
- 101100102849 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) VTH1 gene Proteins 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
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Abstract
The invention discloses a contactor electricity-saving device detection circuit, which is added with a rectifying circuit, a sampling circuit and a threshold comparison circuit on the basis of the existing circuit which is formed by a rectifying bridge and a main power circuit, wherein a reference I and a reference II are arranged in the threshold comparison circuit, and when the peak signal voltage of the output end of the sampling circuit is greater than the reference I, the main power circuit is controlled to work, and a contactor is attracted; when the signal value voltage at 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; when the input voltage is required to be alternating current, the peak voltage of the signal at the output end of the sampling circuit is equal to the signal at the output end of the sampling circuit when the input voltage is direct current, so that the voltage points for triggering the action of the contactor are the same, the purpose that the voltage points of the wide input voltage contactor are consistent in the attraction and release under the condition of the alternating current and direct current input voltage is realized, and the circuit is simple and easy to use, thereby finally realizing the universality of the power-saving device product of the alternating current and direct current contactor and reducing the production and inventory pressure of manufacturers.
Description
Technical Field
The invention relates to the field of alternating-current contactors, in particular to a contactor electricity-saving device detection circuit.
Background
The conventional contactor operating system consists of a coil, a stationary core, an armature, and a reaction spring. When the contactor coil is energized, a suction force is generated between the static core and the armature, when the suction force is larger than the reaction force of the spring, the armature is sucked towards the static core until the armature contacts the static core, at the moment, the main contact is closed, and the process is called a suction process. The coil is continuously electrified, the armature is kept in contact with the static core, and the main contact is kept in a closed state, which is called a holding process. When the current in the coil decreases or breaks, the attraction force of the static core to the armature decreases, and when the attraction force is less than the spring reaction force, the armature returns to the open position and the main contacts separate, a process called a release process. From an electrical point of view, the contactor coil may be equivalently an inductance having a certain internal resistance.
The input voltage range of the traditional contactor is narrow, and the contactor with the same through-current capability can be divided into a plurality of specifications according to the operating voltage of the coil. Taking the common CJ20 contactor as an example, the voltage specification of the 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 ratings
| Coil operating voltage rating US | |
| AC input | 36VAC、127VAC、220VAC、380VAC |
| DC input | 48VDC、110VDC、220VDC |
Meanwhile, the working voltage range of the coil is also narrower, the general pull-in voltage range is 85% -110% US, and the release voltage is 20% -75% US. From the above data, the conventional contactor coil has a narrow working range and a large specification.
The narrow working range of the traditional contactor is caused by the fact that the current of the coil of the contactor changes along with the input voltage, the current is large when the input voltage is high, and the coil is easy to 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-voltage ratio (highest input voltage/lowest input voltage) can reach 9. As a simple example, the coil current may be constant within the range of 30V to 270V of the input voltage, as long as the coil design is appropriate. Therefore, in some contactor factories, the voltage range of normal operation of the coil is 80V-275V, the release voltage is 40-60V, and the input AC/DC is required to be used, and the pull-in and release thresholds are consistent no matter the AC voltage or the DC voltage is input. Similar to such wide input voltage contactor products, voltage detection circuitry is typically required to detect the input voltage to control the contactor
And (5) sucking and releasing.
But there is a problem with ac/dc general purpose. Under the condition that the effective voltage is fixed, the peak value of the alternating current-direct current voltage is different, for example, the alternating current with the effective value of 80V is 113V. In the case of ac/dc universal use, if a simple voltage division sampling is used to compare the thresholds, the ac input will be triggered at a lower voltage, resulting in inconsistent operating voltages for the ac input and the dc input.
Disclosure of Invention
In view of the above, the present invention aims to solve the technical problem that the operation voltage of the contactor can be consistent in the case of ac input and dc input.
In order to achieve the above object, the present invention has the following technical scheme:
the contactor electricity-saving device detection circuit comprises a first rectifier bridge and a main power circuit, wherein the first rectifier bridge is used for controlling the current of a contactor coil; the method is characterized in that: the device also comprises a second rectifier bridge, a sampling circuit and a threshold comparison circuit; the alternating current 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 together 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, and 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 attracted; when the signal valley 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; when the input voltage is alternating current, the peak voltage of the signal at the output end of the sampling circuit is equal to the signal at the output end of the sampling circuit when the input voltage is direct current.
As an improvement of the scheme, the output end of the sampling circuit can be connected with a voltage stabilizing diode in parallel, 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.
As a first specific implementation mode of the sampling circuit, the sampling circuit consists of a resistor R1, a resistor R2 and a capacitor C1, wherein 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 connecting 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 specific embodiment of the above sampling circuit, the sampling circuit further includes a zener diode Z1, where the zener diode Z1 is connected in parallel to two ends of the capacitor C1, and 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.
As a second specific implementation mode of the sampling circuit, the sampling circuit consists of an inductor L1, a resistor R3 and a resistor R4, wherein 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 specific embodiment of the above sampling circuit, the sampling circuit further includes a zener diode Z1, where the zener diode Z1 is connected in parallel to two ends of the resistor R4, and 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.
Another technical scheme as the same inventive concept of the present application is as follows:
the contactor electricity-saving device detection circuit comprises a first rectifier bridge and a main power circuit, wherein the first rectifier bridge 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 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; a first reference and a second reference are arranged in the threshold comparison circuit, and 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 attracted; when the signal value voltage at 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; when the input voltage is alternating current, the peak voltage of the signal at the output end of the sampling circuit is equal to the signal at the output end of the sampling circuit when the input voltage is direct current.
As an improvement of the scheme, a zener diode can be connected in parallel with the output end of the sampling circuit, the cathode of the zener diode is connected with the output end of the sampling circuit, and the anode of the zener diode is grounded.
As a first specific implementation mode of the sampling circuit, the sampling circuit is composed of a resistor R1, a resistor R2 and a capacitor C1, wherein the resistor R1 and the resistor R2 are connected in series, one end of the resistor R1 and one end of the resistor R2 which are connected in series are connected with the cathode connection point of the first diode and the cathode connection point of the second diode, the other end of the resistor R1 and the other end of the resistor R2 which are connected in series are grounded, one end of the capacitor C1 is connected with the 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 specific embodiment of the above sampling circuit, the sampling circuit further includes a zener diode Z1, where the zener diode Z1 is connected in parallel to two ends of the capacitor C1, and 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.
As a second specific implementation mode of the sampling circuit, the sampling circuit consists of an inductor L1, a resistor R3 and a resistor R4, wherein 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 specific embodiment of the above sampling circuit, the sampling circuit further includes a zener diode Z1, where the zener diode Z1 is connected in parallel to two ends of the resistor R4, and 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 working principle of the invention is analyzed as follows:
the output end signal of the sampling circuit is recorded as VT; the first reference and the second reference in the threshold comparison circuit are respectively denoted as VTH1 and VTH2.
When the peak voltage of the signal VT is larger than VTH1, the main power circuit is controlled to work, and the contactor is attracted; when the valley voltage of the signal VT is smaller than VTH2, the main power circuit is controlled to be closed, 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 dc, the gain of the sampling circuit from the input to the output is denoted as a (0). When the input voltage is a power frequency 50Hz signal, the fundamental frequency of the rectified voltage is 100Hz, the gain from the input to the output of the sampling circuit is recorded as A (100),
the formula of the rectified AC input voltage is as follows:
wherein the UE is an input voltage effective value. The VIN-AC (t) is subjected to Fourier series expansion, harmonic components above 200Hz are very small, the components above 200Hz can be ignored, only 100Hz harmonic components and direct current components are reserved, and the obtained formula is as follows:
after the rectified alternating current bus voltage passes through the sampling circuit, the voltage formula of the signal VT is as follows:
at the time of alternating current input, the peak voltage of the signal VT is:
at the time of direct current input, the voltage of the signal VT is:
VT DC ＝U E ·A(0)
the beneficial effects of the invention are as follows: by selecting parameters of the sampling circuit, proper A (0) and A (100) are set to ensure VT DC ＝VT AC Under the condition of the same AC/DC voltage effective value, the peak voltage of the signal VT is the same, the voltage point triggering the contactor to act is the same, the purpose that the voltage points of the wide input voltage contactor are consistent in the attraction and release under the condition of the AC/DC input voltage is realized, and the circuit is simple and easy to use, so that the universality of the power-saving device product of the AC/DC contactor can be finally realized, and the production and stock pressure of manufacturers are reduced.
Meanwhile, after the voltage stabilizing diode Z1 is added, the voltage of the signal VT can be limited, when the input voltage is high-voltage, the time for the voltage of the signal VT to drop to the undervoltage threshold after the input power failure is shorter, and the delay time of the 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 a signal VT at different input voltages according to a first embodiment of the 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, wherein the present invention is characterized in that a rectifying circuit, a sampling circuit and a threshold comparison circuit are added on the basis of the existing circuit which is formed by a rectifying bridge and a main power circuit and is used for forming a contactor electricity-saving device, a reference I and a reference II are arranged in the threshold comparison circuit, and when the peak signal voltage of the output end of the sampling circuit is greater than the reference I, the main power circuit is controlled to work, and the contactor is attracted; when the signal value voltage at 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; when the input voltage is required to be alternating current, the peak voltage of the signal at the output end of the sampling circuit is equal to the signal at the output end of the sampling circuit when the input voltage is direct current, so that the voltage points for triggering the action of the contactor are the same, the purpose that the voltage points of the wide input voltage contactor are consistent in the attraction and release under the condition of the alternating current and direct current input voltage is realized, and the circuit is simple and easy to use, thereby finally realizing the universality of the power-saving device product of the alternating current and direct current contactor and reducing the production and inventory pressure of manufacturers.
In order that the invention may be more readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
First embodiment
Fig. 2 is a schematic diagram of a first embodiment of the present invention, and a general contactor power saver includes a rectifier bridge DB1 and a main power circuit for controlling the current of a 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 a main power circuit, and the negative output end of the rectifier bridge DB1 is connected with 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, a connecting point of the resistor R1 and the resistor R2 is used as an output end to be 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 includes a zener diode Z1, where the zener diode Z1 is connected in parallel to two ends of the C1, and 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 resistor R1 and resistor R2 is referred to as signal VT, and references VTH1 and VTH2 are provided in the threshold comparison circuit. When the peak voltage of the signal VT is larger than VTH1, the main power circuit is controlled to work, and the contactor is attracted; when the valley voltage of the signal VT is smaller than VTH2, the main power circuit is controlled to be closed, and the contactor is released.
The working principle of the present invention is explained below. The sampling circuit consisting of resistor R1, resistor R2 and capacitor C1 can be simplified by the davin theorem as shown in fig. 3. The equivalent relationship is as follows:
wherein VBUS2 is the rectified bus voltage. The transfer function of the voltage divider circuit formed by RD and C1 is as follows:
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:
A D (0)＝1
when the input voltage is power frequency alternating current,
when the input is a direct current 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 proper values of the resistor R1, the resistor R2 and the capacitor C1, the VT can be realized DC ＝VT AC Finally, the trigger voltage is the same when the direct current is input and the alternating current is input, and the effect of alternating current and direct current is achieved.
The actual effect of the present invention will be described below with a specific set of data. Let the pull-in threshold compared to VT be 1.2V, the pull-out threshold be 0.8V, r1=3mΩ, r2=50kΩ, c1=0.22 uF, frequency f=100 Hz of the rectified bus voltage. Substituting the above formula, the trigger voltage points for the dc input and the ac input can be obtained as shown in table 2. It can be seen from the table that the requirements of the current new products are met under the condition of AC/DC input. A more intuitive effect is shown in fig. 4, which shows the voltage values of the signal VT at different input voltages.
TABLE 2 trigger Point at AC/DC input Using the present invention
| AC input | DC input | |
| Pull-in voltage | 74VAC | 73VDC |
| Releasing voltage | 60VAC | 49VDC |
If the method of the invention is not adopted, the bus voltage VBUS2 of the main power circuit is directly sampled, and the actual effect is shown in the table 3. The bus voltage of the main power is directly sampled, the voltage amplitude of the bus voltage is related to the bus capacitance and the power consumption of the main power circuit, and is an uncertain value, and the difference between the pull-in voltage point and the pull-out voltage point of alternating current and direct current is too large.
Table 3 trigger point at AC/DC input without employing the invention
| AC input | DC input | |
| Pull-in voltage | 51VAC | 73VDC |
| Releasing voltage | Uncertainty of | 49VDC |
Through the principle analysis, the circuit can make the pull-in voltage point and the pull-out voltage point of alternating current and direct current consistent, and is simple and 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 after being 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 includes a zener diode Z1, where the zener diode Z1 is connected in parallel to two ends of the resistor R4, and 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 formed by the inductance L1, the resistance R3 and the resistance 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 inductance L1, the resistance R3, and the resistance 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 grounded in the rectifier bridge DB 1. The connection relation is as follows: the anode of the diode D1 is connected with one end of the alternating current input AC of the rectifier bridge DB1, and the anode of the diode D2 is connected with the other end of the alternating current input AC 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, a connection point of the resistor R1 and the resistor R2 is used as an output end to be connected with a threshold comparison circuit, the other end of the resistor R2 is connected with the negative output end of a rectifier bridge DB2 and then is grounded, a capacitor C1 is connected with two ends of the resistor R2 in parallel, and the threshold comparison circuit is connected with a main power circuit. The embodiment further includes a zener diode Z1, where the zener diode Z1 is connected in parallel to two ends of the C1, and 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 third is that 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 grounded in the rectifier bridge DB1 constitute DB2 in the first embodiment. The other partial 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 grounded in the rectifier bridge DB 1. The connection relation is as follows: the anode of the diode D1 is connected with one end of the alternating current input AC of the rectifier bridge DB1, the anode of the diode D2 is connected with the other end of the alternating current input AC of the rectifier bridge DB1, 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 passing through an inductor L1, a resistor R3 and a resistor R4 in sequence, and the connection point of the resistor R3 and the resistor R4 is the output end of the sampling circuit. The embodiment further includes a zener diode Z1, where the zener diode Z1 is connected in parallel to two ends of the resistor R4, and 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 principle of the fourth embodiment is basically the same as that of the second embodiment. In the third embodiment, the diode D1, the diode D2, and two diodes grounded in the rectifier bridge DB1 constitute DB2 in the second embodiment. The other partial circuits are the same as those of the first embodiment.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the invention, and the scope of the invention should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (12)
1. The contactor electricity-saving device detection circuit comprises a first rectifier bridge and a main power circuit, wherein the first rectifier bridge is used for controlling the current of a contactor coil; the method is characterized in that: the device also comprises a second rectifier bridge, a sampling circuit and a threshold comparison circuit; the alternating current 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 together 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, and 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 attracted; when the signal valley 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; when the input voltage is alternating current, the peak voltage of the signal at the output end of the sampling circuit is equal to the signal at the output end of the sampling circuit when the input voltage is direct current.
2. The contactor power saver detection circuit of claim 1, wherein: the 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, wherein 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 connecting point of the resistor R1 and the resistor R2, the other end of the capacitor C1 is grounded, and the connecting point of the capacitor C1, the resistor R1 and the resistor R2 is an output end of the sampling circuit.
4. A contactor electricity saver detection circuit according to claim 3, wherein: the sampling circuit further comprises a zener diode Z1, wherein the zener diode Z1 is connected in parallel with two ends of the C1, the cathode of the zener diode Z1 is connected with the connecting point of the resistor R1, the resistor R2 and the capacitor C1, and the anode of the zener diode Z1 is grounded.
5. The contactor power saver detection circuit of claim 1, wherein: the sampling circuit is composed of an inductor L1, a resistor R3 and a resistor R4, wherein 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 connecting point of the resistor R3 and the resistor R4 is an output end of the sampling circuit.
6. The contactor power saver detection circuit of claim 5, wherein: the sampling circuit further comprises a zener diode Z1, wherein the zener diode Z1 is connected in parallel with two ends of the resistor R4, the cathode of the zener diode Z1 is connected with the connection point of the resistor R3 and the resistor R4, and the anode of the zener diode Z1 is grounded.
7. The contactor electricity-saving device detection circuit comprises a first rectifier bridge and a main power circuit, wherein the first rectifier bridge 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 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, and 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 attracted; when the signal valley 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; when the input voltage is alternating current, the peak voltage of the signal at the output end of the sampling circuit is equal to the signal at the output end of the sampling circuit when the input voltage is direct current.
8. The contactor power saver detection circuit of claim 7, wherein: the 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 comprises a resistor R1, a resistor R2 and a capacitor C1, wherein the resistor R1 and the resistor R2 are connected in series, one end of the resistor R1 and one end of the resistor R2 connected in series are connected with the cathode connection point of the first diode and the second diode, the other end of the resistor R1 and the other end of the resistor R2 connected in series are grounded, one end of the 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 zener diode Z1, wherein the zener diode Z1 is connected in parallel with two ends of the C1, the cathode of the zener diode Z1 is connected with the connecting point of the resistor R1, the resistor R2 and the capacitor C1, and the anode of the zener diode Z1 is grounded.
11. The contactor power saver detection circuit of claim 7, wherein: 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.
12. The contactor power saver detection circuit of claim 11, wherein: the sampling circuit further comprises a zener diode Z1, wherein the zener diode Z1 is connected in parallel with two ends of the resistor R4, the cathode of the zener diode Z1 is connected with the connection point of the resistor R3 and the resistor R4, and the anode of the zener diode Z1 is grounded.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810139788.2A CN108387810B (en) | 2018-02-11 | 2018-02-11 | Contactor electricity-saving appliance detection circuit |
| PCT/CN2018/116948 WO2019153834A1 (en) | 2018-02-11 | 2018-11-22 | Contactor energy saving test circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810139788.2A CN108387810B (en) | 2018-02-11 | 2018-02-11 | Contactor electricity-saving appliance detection circuit |
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| CN108387810A CN108387810A (en) | 2018-08-10 |
| CN108387810B true CN108387810B (en) | 2024-02-20 |
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| CN201810139788.2A Active CN108387810B (en) | 2018-02-11 | 2018-02-11 | Contactor electricity-saving appliance detection circuit |
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| CN108387810B (en) * | 2018-02-11 | 2024-02-20 | 广州金升阳科技有限公司 | Contactor electricity-saving appliance detection circuit |
| 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 |
| CN111239460B (en) * | 2018-11-28 | 2022-02-11 | 广东威灵汽车部件有限公司 | Sampling circuit and electrical equipment |
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| CN108387810A (en) | 2018-08-10 |
| WO2019153834A1 (en) | 2019-08-15 |
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