CN215183735U - Energy-saving relay or contactor control circuit - Google Patents

Abstract

The application relates to the technical field of relays and contactors, in particular to an energy-saving relay or contactor control circuit, which comprises an input and protection module, and a resistance-capacitance delay driving module, a starting coil control module, a proportional voltage division driving module and a holding coil control module which are sequentially connected with the output end of the input and protection module. The circuit realizes the reliable on-off capacity of a product under the complex external characteristics of a power supply, reduces the interference influence of reverse turn-off voltage of the double coils on an external control circuit, realizes quick turn-off, reduces the condition of arc discharge of contacts, greatly prolongs the service life of a relay or a contactor, simultaneously realizes two energy-saving circuits of starting of the parallel double coils and maintaining of the series double coils, meets the energy-saving control of different coil structures, realizes the function of reliable work under the condition of poor external characteristics of the power supply, and reduces the design difficulty and the cost of a mechanical structure under the limiting condition (power or volume and the like).

Description

Energy-saving relay or contactor control circuit

Technical Field

The application relates to the technical field of relays and contactors, in particular to an energy-saving relay or contactor control circuit.

Background

The traditional RC delay energy-saving circuit requires that the external characteristic of a used power supply is a stable voltage of 0V or rated voltage, and the external characteristic is a stepped voltage signal of the two when the circuit is switched. The external characteristics of the actual power supply mostly have practical application scenes such as slow rising or falling, instantaneous undervoltage after load loading or rapid on-off, and the like, which can cause the failure of the RC delay circuit. Such failures are also a common cause of failure in solid state or hybrid delay relays that employ RC delay circuits. In the application of power supply by a storage battery, particularly in the traditional automobile and new energy automobile industry, the influence of the external characteristics of the power supply is more remarkable, and the external characteristics can cause the following 4 fault phenomena:

1. when the power supply slowly rises from 0V to rated voltage, the rising time is far longer than the working time of the starting coil, namely, the RC delay time, although the power supply voltage is under low voltage, the RC delay time circuit starts to work, the starting coil is electrified under low voltage and works in a delayed mode for a certain time, when the delay time is over, the starting coil is powered off, the starting coil is always in a lower under-voltage state in the process, the starting voltage is not reached, the attraction of the contact cannot be realized, and when the voltage slowly rises to the rated voltage, the contact cannot be attracted or can be attracted reliably because the coil enters a holding state; when the power supply voltage slowly drops, the coil has no step reset counter force when being turned off, and the coil cannot be reliably turned off (a permanent magnet type) to cause functional failure;

2. when a heavy load is added into a power grid, the voltage of a power supply is instantaneously (less than or equal to 10ms) reduced to a lower voltage (for example, 4.5V in an automobile), and then the voltage is quickly restored to a rated voltage again, so that the instantaneous lack of retention force can be caused during the instantaneous power failure, and the contact is disconnected; after the power supply is disconnected, when the power supply is rapidly stepped from a non-zero (example 4.5V) voltage to a rated working voltage again, the traditional RC delay circuit cannot be reset, the starting coil cannot work again, and the functional failure of continuous failure is caused;

3. under the application situation of quick switching, when a power supply is quickly switched by a step signal of 0V and rated voltage, the contact of a relay or a contactor is switched between an off state and an on state, but when the switching interval time is less than RC delay time (100ms), because the traditional RC delay circuit cannot be quickly reset, a starting coil does not normally work, the contact cannot be reliably attracted, or cannot be reliably switched off, and the functional failure is caused;

4. if the reverse voltage that electromagnetic type relay or contactor coil produced when turn-offs does not restrain, can seriously harm external control circuit, the twin coil structure is more serious, and some traditional relay or contactor coil have built-in the return circuit of releasing, have certain suppression reverse voltage's function, but have nevertheless aroused turn-off time by a wide margin extension and contact rebound number of times and obviously increase, arc time extension when leading to the contact to turn-off, the number of times increases, has seriously reduced product life.

SUMMERY OF THE UTILITY MODEL

In order to solve one of the above technical problems, the present application provides an energy-saving relay or contactor control circuit, which includes an input and protection module for rectifying, filtering and preventing surge of a power supply signal VCC, a resistance-capacitance delay driving module, a starting coil control module connected with a starting coil, a proportional voltage division driving module, and a holding coil control module connected with a holding coil, wherein the resistance-capacitance delay driving module, the starting coil control module, the proportional voltage division driving module, and the holding coil control module are sequentially connected to output ends of the input and protection module; the resistance-capacitance delay driving module and the starting coil control module are used for controlling the starting coil L1 to realize the switching among the starting state, the switching state and the holding state of a relay or a contactor, the proportional voltage division driving module controls the holding coil L2 to be in the on-off state.

Preferably, the input and protection module comprises a diode D1, a transient suppression diode TVS, and a capacitor C1; diode D1 one end connect supply signal VCC, the other end respectively with transient suppression diode TVS with electric capacity C1 connects, transient suppression diode TVS with electric capacity C1's the other end ground connection.

Preferably, the resistance-capacitance delay driving module includes a resistor R7 connected to the output end of the input and protection module, a MOS transistor Q1 connected in series with the resistor R7, a resistance-capacitance charging delay circuit connected to the gate of the MOS transistor Q1, and a fast reset circuit connected to the resistance-capacitance charging delay circuit, where the resistance-capacitance charging delay circuit controls the MOS transistor Q1 to be turned on and off; the resistor R7 and the MOS tube Q1 are connected with the starting coil control module.

Preferably, the resistance-capacitance charging delay circuit comprises a resistor R1 connected with the output end of the input and protection module, a capacitor C2 connected with the resistor R1 in series through a diode D3, a resistor R5 connected with two ends of the capacitor C2 in parallel, and a zener diode D4; the diode D3 and the capacitor C2, the common terminal of the voltage stabilizing diode D4 and the resistor R5 are connected with the grid electrode of the MOS tube Q1 through the voltage stabilizing diode D5 and the resistor R6 which are connected in series, and the other ends of the capacitor C2, the voltage stabilizing diode D4 and the resistor R5 and the source electrode of the MOS tube Q1 are grounded.

Preferably, the fast reset circuit comprises a diode D3, a resistor R3, and a transistor V1 and a resistor R4 connected in parallel to two ends of the capacitor C2; the base electrode of the triode V1 is connected with the resistor R3; one end of the diode D3 is connected with the resistor R1 and the emitter of the triode V1, and the other end of the diode D3 is connected with the capacitor C2.

Preferably, the start-up coil control module comprises a start-up coil L1 connected to the output end of the input and protection module, and the other end of the start-up coil L1 is connected in series to the drain of the MOS transistor Q2; the gate of the MOS transistor Q2 is connected with the drain of the MOS transistor Q1 and the common end of the resistor R7, and the voltage stabilizing diode D6 is connected with the gate and the source of the MOS transistor Q2 in parallel.

Preferably, the holding coil control module comprises a holding coil L2 connected with the output end of the input and protection module, and a MOS transistor Q3 connected in series with the holding coil L2, wherein the holding coil L2 is connected with the drain of the MOS transistor Q3; the gate of the MOS transistor Q3 is connected with the proportional voltage division driving module.

Preferably, the proportional voltage division driving module comprises a resistor R8 and a resistor R9 connected in series, and diodes D12 and D11; one end of the resistor R8 is connected with the input and protection module, and the other end is connected with the gate of the MOS transistor Q3 through the diode D12. The diode D11 is connected in parallel with the gate and source poles of the MOS transistor Q3.

Preferably, the starting coil L1 is connected in parallel with the holding coil L2; the starting coil L1 and the holding coil L2 are both connected with a coil bleeder circuit in parallel; the coil bleed circuit includes a zener diode and an anti-parallel diode.

Preferably, the start coil L1 is connected in series with the hold coil L2; coil bleeder circuits are connected in parallel at two ends of the starting coil L1 and the holding coil L2; the coil leakage loop comprises a voltage stabilizing diode and an anti-parallel diode, and after the starting coil L1 and the holding coil L2 are connected in series, a second coil leakage loop is connected in parallel between one end of the starting coil L1 and one end of the holding coil L2 (both are non-connection common ends).

From the above, the following beneficial effects can be obtained by applying the method provided by the present application: the ability of reliable switch-on and turn-off of product under complicated power supply external characteristic has been realized, reduce the back pressure of twin coil to external control circuit's interference influence and realize turning off fast, reduce the condition that the contact draws the arc, prolong the life-span of relay or contactor by a wide margin, circuit structure has realized two kinds of energy-conserving circuits of parallelly connected twin coil and series connection twin coil simultaneously, satisfy the energy-conserving control of different coil structures, realized under bad power supply external characteristic condition, realize reliable work's function, two kinds of circuit structure have simultaneously reduced the design degree of difficulty and the cost of coil structure under the restriction condition by a wide margin, the structural design flexibility ratio has been improved, the technological effect who reaches has:

1. when the double-coil parallel starting or the single-coil starting is carried out, the power consumption is large, the current is the largest, the electromagnetic attraction is the largest, the reliable attraction of the contact is ensured before the resistance-capacitance delay time is over, and the low-power consumption state of the single-coil or double-coil serial work is switched after the resistance-capacitance delay time is over, so that the purpose of energy conservation is realized. When the power supply voltage VCC is higher than the rated voltage, the current of the coil is increased, the electromagnetic attraction is increased, the contact can be attracted in a short time, and simultaneously, the RC delay is shortened due to the increase of the voltage, so the electrifying time of the starting coil is shortened, the starting coil quickly enters a low-power-consumption working state, and the starting power of the relay or the contactor is further dynamically reduced; when the power supply voltage VCC is lower than the rated voltage, the current is reduced, and simultaneously, the RC time delay is prolonged due to the reduction of the voltage, the electrifying time of the starting coil is prolonged, and the influence of unreliable attraction and insufficient attraction of the contact caused by the reduction of the coil current is further reduced by prolonging the on-off time. The circuit further realizes dynamic adjustment of starting power consumption, realizes energy conservation and ensures reliable pull-in under different power supply characteristics.

2. The novel resistance-capacitance charging delay circuit related by the application realizes delay under slow boosting, proper device parameters are selected, proper abnormal starting voltage is set, when the power supply voltage is smaller than the abnormal starting voltage, the starting coil continuously keeps working until the abnormal voltage disappears, namely, under the abnormal voltage, the starting coil of the relay or the contactor continuously works, has larger electromagnetic force, always has the capability of reliably attracting a contact, and avoids the failure of the delay circuit caused by slow boosting and the functional failure of a product caused by the failure of the starting coil;

3. when the power supply step signal is switched, when the switching interval time is less than RC resistance-capacitance delay time, under the application situation of quick switching, the quick reset circuit enables the starting coil to work normally, the contact is reliably attracted, and the functional failure is avoided;

4. the coil leakage loop is used for inhibiting the starting coil L1 and the holding coil L2 from generating reverse voltage in the outage time, so that the back voltage inhibition function is realized, the contact disconnection time of the relay or the contactor is shortened, the contact bounce times are reduced, the contact arcing condition caused by the reasons is reduced, and the service life of the relay or the contactor is greatly prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments of the present application or the prior art will be briefly described below. It should be apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without inventive exercise.

Fig. 1 is a schematic diagram of a control circuit of an energy-saving relay or contactor according to embodiment 1 of the present application;

fig. 2 is a schematic diagram of a control circuit of an energy-saving relay or contactor according to embodiment 2 of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1

The traditional RC delay energy-saving circuit requires that the external characteristic of a used power supply is a stable voltage of 0V or rated voltage, and the external characteristic is a stepped voltage signal of the two when the circuit is switched. The external characteristics of the actual power supply mostly have application scenes of slow rising or falling, instantaneous undervoltage after loading or quick on-off, which can cause the failure of the traditional resistance-capacitance RC time-delay energy-saving circuit. The practical application scenario is also the reason of common functional failure of the mixed delay relay or contactor adopting the resistance-capacitance RC delay circuit and the solid-state delay relay or contactor.

In order to solve the above technical problem, the present embodiment provides an energy-saving relay or contactor control circuit, as shown in fig. 1, which includes an input and protection module 1 for rectifying, filtering and preventing surge of a power supply signal VCC, a resistance-capacitance delay driving module 2, a starting coil control module 3 connected with a starting coil, a proportional voltage division driving module 4, and a holding coil control module 5 connected with a holding coil, which are sequentially connected to an output end of the input and protection module 1. The resistance-capacitance delay driving module 2 is connected with the starting coil control module 3, the resistance-capacitance delay driving module and the starting coil control module are jointly operated to realize the control of the starting coil L1 under the external characteristics of different power supplies, the switching state and the holding state of a relay or a contactor are converted, and the proportional voltage division driving module 4 is connected with the holding coil control module 5 and is used for controlling the conduction state of the holding coil L2.

The RC delay circuit for the energy-saving relay or contactor control circuit inherits the characteristics of high reliability, low cost and excellent electromagnetic compatibility of the traditional RC delay circuit, and the special circuit structure design realizes the reliable on-off capability of the product under the characteristic of a complex power supply, avoids causing functional failure and has the capability of further dynamically adjusting the starting power consumption; the coil discharge loop reduces the interference influence of the back pressure of the double coils on an external control circuit, realizes quick turn-off, reduces contact bounce, reduces the condition of contact arc discharge, and greatly prolongs the service life of a relay or a contactor.

Specifically, the input and protection module 1 includes a schottky diode D1, a transient suppression diode TVS, and a capacitor C1; the transient suppression diode TVS is connected with the capacitor C1 in parallel, one end of the Schottky diode D1 is connected with a power supply signal VCC, the other end of the Schottky diode D1 is connected with the transient suppression diode TVS and the capacitor C1 respectively, and the other ends of the transient suppression diode TVS and the capacitor C1 are grounded. The module realizes the functions of rectifying, filtering, preventing surge voltage and the like on a power supply signal VCC through devices such as a diode D1, a transient suppression diode TVS, a capacitor C1 and the like. The functions of rectification, filtering, surge voltage prevention and the like can be realized by replacing other electronic components or circuits with the same function.

The start-up coil control module 3 comprises a start-up coil L1 and a MOS transistor Q2, the start-up coil L1 is connected with the output end of the input and protection module 1, the other end of the start-up coil L1 is connected in series with the drain of the MOS transistor Q2, the gate of the MOS transistor Q2 is connected with the drain of the MOS transistor Q1 and the resistor R7, and the zener diode D6 is connected in parallel with the gate and the source of the MOS transistor Q2. The holding coil control module 5 comprises a holding coil L2 connected with the output end of the input and protection module 1 and a MOS tube Q3 connected with the holding coil L2 in series, wherein the holding coil L2 is connected with the drain electrode of the MOS tube Q3, and the grid electrode of the MOS tube Q3 is connected with the proportional voltage division driving module 4.

The circuit provided by the implementation is a relay or contactor control circuit started in parallel with double coils, a starting coil L1 and a holding coil L2 work in a parallel mode when a product is started to form a double-coil parallel structure, and a coil bleeder circuit is connected in parallel with both the starting coil L1 and the holding coil L2; the coil bleed circuit includes a zener diode and an anti-parallel diode.

The resistance-capacitance delay driving module 2 comprises a resistor R7 connected with the output end of the input and protection module 1, an MOS transistor Q1 connected in series with the resistor R7, a resistance-capacitance charging delay circuit connected with the grid electrode of the MOS transistor Q1 and a quick reset circuit connected with the resistance-capacitance charging delay circuit, wherein the resistance-capacitance charging delay circuit controls the MOS transistor Q1 to be switched on and switched off, and the grid electrode of the MOS transistor Q1 is connected with the resistance-capacitance charging delay circuit. Specifically, the resistance-capacitance charging delay circuit comprises a resistor R1 connected with the output end of the input and protection module 1, a capacitor C2 connected with the resistor R1 in series through a diode D3, a resistor R5 connected with two ends of the capacitor C2 in parallel, and a voltage-stabilizing diode D4; the common end of the diode D3, the capacitor C2, the voltage stabilizing diode D4 and the resistor R5 is connected with the grid electrode of the MOS tube Q1 through the voltage stabilizing diode D5 and the resistor R6 which are connected in series, and the other ends of the capacitor C2, the voltage stabilizing diode D4 and the resistor R5 are grounded with the source electrode of the MOS tube Q1. The quick reset circuit comprises a diode D3, a resistor R3, a triode V1 and a resistor R4 which are connected in parallel with two ends of a capacitor C2, wherein the base electrode of the triode V1 is connected with the resistor R3, and the resistor R3 is connected with the resistor R1; the diode D3 is connected with the resistor R1 and the emitter of the triode V1; one end of the resistor R4 is connected with the collector of the triode V1, and the other end is grounded.

The proportional voltage division driving module 4 comprises a resistor R8, a resistor R9 and a diode D12 which are connected in series, one end of the resistor R8 is connected with the output end of the input and protection module 1, the other end of the resistor R8 is connected with the resistor R9, the common point is connected with the grid electrode of the MOS tube Q3 through a diode D12, and the diode D11 is connected with the grid electrode and the source electrode of the MOS tube Q3 in parallel.

In a starting state, the resistor R1 charges the capacitor C2, the resistor-capacitor charging delay circuit controls the grid of the delay switch MOS tube Q1 in a boosting mode during power-on, and as the voltage cannot jump, the channel of the MOS tube Q1 is closed and is in a disconnected state, and in the double-coil parallel type structural circuit, the working state of the process is as follows: under the circuit formed by the MOS tube Q1 and the resistor R7, the grid of the MOS tube Q2 is at a high level, the MOS tube Q2 is in a conducting state, so that the starting coil L1 works, the starting coil L1 and the holding coil L2 work in parallel, double-coil parallel starting is formed together, the current is maximum, the power consumption is high, the electromagnetic attraction is maximum, and the reliable attraction of the contact is ensured before the resistance-capacitance delay time is over. Further, reasonable device parameters are set, the resistance-capacitance delay time can be calculated, and the relay or the contactor has the following characteristics: when the power supply voltage VCC is higher than the rated voltage, the coil current is increased, the electromagnetic attraction is increased, the contact can be attracted in a short time, the RC delay is shortened due to the increase of the voltage, the electrifying time of the starting coil L1 is shortened, compared with the rated voltage, the product can be quickly switched to a low-power-consumption working state, and the starting power of the relay or the contactor is further dynamically reduced; when the power supply voltage VCC is lower than the rated voltage, the current is reduced, the RC delay is prolonged due to the reduction of the voltage, the electrifying time of the starting coil L1 is prolonged, the influence of unreliable attraction of the contact is generated due to the reduction of the attraction caused by the reduction of the coil current, and the reliable attraction of the contact is ensured by compensating by prolonging the electrifying time of the coil. Under the set condition, the circuit has the advantage of further realizing the dynamic adjustment of the starting power.

When the delay time is reached, the switching state is entered, the voltage at the end of the capacitor C2 is higher than the minimum grid starting voltage of the delayed MOS tube Q1, the MOS tube Q1 is conducted, and the resistor R7 drives the MOS tube Q2 to be switched off, the circuit is switched from the starting state to the energy-saving low-power-consumption holding state, and in the double-coil parallel structure circuit, the working modes of the coils are switched as follows in the process: the MOS tube Q2 is turned off, the starting coil L1 is turned off, and only the coil L2 is kept to work, so that single coil maintenance is realized, the current is minimum, and the power consumption is low. When the power supply is in a power-off state, the single holding coil loses power, and the contact is switched off.

The operation modes under the external characteristic of the poor power supply comprise slow boosting starting, instantaneous undervoltage under a holding state and quick starting after the shutdown.

In the operating state under slow boost pressure: in the resistance-capacitance charging delay circuit module 2, a resistor R1 and a resistor R5 of the resistance-capacitance charging delay circuit divide voltage and then charge a capacitor C2, the delay circuit is realized under slow boosting, appropriate device parameters are selected, appropriate abnormal starting voltage is set, when the power supply voltage is less than the abnormal starting voltage, a starting coil L1 keeps working continuously, a relay or a contactor coil always has the capability of reliably attracting a contact, when the abnormal starting voltage disappears and returns to normal voltage, the starting coil L1 is turned off in a delayed mode, and the relay or the contactor is switched to enter a holding state of energy-saving single coil working.

In the operating state under transient undervoltage: because the existence of quick reset circuit, under the condition of reasonable setting parameter, the voltage of the electric capacity C2 end of undervoltage back resistance-capacitance charging delay circuit will jump to undervoltage voltage rapidly, will trigger MOS pipe Q1 and turn off once more this moment, MOS pipe Q2 with start-up coil L1 series connection will switch on once more, start-up coil L1 that has great electric current and electromagnetic force is switched on once more, realize that the twin coil under the instantaneous undervoltage keeps, the compensation single coil holding power is not enough, guarantee that the disconnection can not appear in the contact under the undervoltage. After the instantaneous undervoltage, when fast recovering to rated operating voltage once more, because RC delay circuit voltage can't jump, after boosting along with charging, MOS pipe Q2 is turn-off by the time delay once more, start coil L1 is disconnected once more when the delay time finishes, relay or contactor have got into the low-power consumption's that the single coil keeps operating mode once more, this kind of circuit design mode, need not through the complicated structural design of double coil or through complicated digital control circuit such as real-time dynamic monitoring voltage, the characteristic of the reliable work of relay or contactor under the instantaneous undervoltage can be realized, and very big reduction the design degree of difficulty.

In the rapid start-up after shutdown state: when the power supply voltage is turned off, the contacts are completely disconnected, the coil is quickly powered on again for starting, the traditional resistance-capacitance delay mode cannot be quickly reset, the starting coil is continuously in a turn-off state after being powered on again, only the coil is kept to work, the relay or the contactor contact has the failure phenomenon that the coil cannot be reliably attracted or not attracted, the circuit resets to a zero state in a short time after each power failure through the quick reset circuit consisting of the diode D3, the triode V1, the resistors R3 and the R4, the delay circuit is powered on again for restarting time delay, and the starting coil is powered on again to enter the starting state.

Through a proportional voltage division driving circuit composed of a resistor R8, a resistor R9 and a diode D12 in the proportional voltage division driving module 4, appropriate device parameters are set to drive the grid of the MOS tube Q3, so that the MOS tube Q3 is conducted, and in the whole power supply power-on process, the holding coil L2 is always in a conducting state, and the holding state of double-coil starting or single-coil starting is realized with the starting coil L1. When the power is off, all the MOS transistors are turned off because there is no current in the circuit, and the coil L2 is kept currentless.

In the resistance-capacitance delay driving module 2 and the proportional voltage-dividing driving module 4, the front ends of the gates of the MOS transistor Q1, the MOS transistor Q2 and the MOS transistor Q3 are respectively connected to the zener diode D4, the zener diode D6 and the zener diode D11, the gate of the MOS transistor is protected under an overvoltage condition through the zener diode D4, the zener diode D6 and the zener diode D11, and the situation of overvoltage breakdown between the gate and the source of the MOS transistor Q1, the MOS transistor Q2 and the MOS transistor Q3 is protected.

In order to suppress the reverse voltage generated by the coil, in the start coil control module 3 and the hold coil control module 5 of the present embodiment, coil bleed circuits are respectively designed at two ends of the ports of the start coil L1 and the hold coil L2, and in the present embodiment, the coil bleed circuits include a zener diode D7 and an anti-parallel diode D8 connected in parallel with the start coil L1, and a zener diode D9 and an anti-parallel diode D10 connected in parallel with the hold coil L2. One end of a voltage stabilizing diode D7 is connected with the starting coil L1, the other end of the voltage stabilizing diode D7 is connected with the anti-parallel diode D8, and the other end of the anti-parallel diode D8 is connected with the other end of the starting coil L1; one end of a voltage stabilizing diode D9 is connected with a holding coil L2, the other end of the voltage stabilizing diode D9 is connected with an anti-parallel diode D10, the other end of the anti-parallel diode D10 is connected with the other end of a holding coil L2, reverse voltage generated when a starting coil L1 and a holding coil L2 are turned off is restrained through a coil leakage loop, the turn-off time of contacts of a relay or a contactor is shortened, and the rebound times of the contacts are reduced when the contacts are turned off.

Example 2

This embodiment provides a double coil series energy-saving relay or contactor control circuit, as shown in fig. 2, the control circuit also includes an input and protection module 1 for rectifying, filtering and preventing surge of a power supply signal VCC, a resistance-capacitance delay driving module 2, a starting coil control module 3 connected with a starting coil, a proportional voltage-dividing driving module 4 and a holding coil control module 5 connected with a holding coil, wherein the resistance-capacitance delay driving module 2 is sequentially connected with an output end of the input and protection module 1.

The start coil control module 3 comprises a start coil L1 and a MOS transistor Q2 connected with the output end of the input and protection module 1, a drain of the MOS transistor Q2 connected with the other end of the start coil L1 in series, a source of the MOS transistor Q2 is grounded, a gate of the MOS transistor Q2 is connected with a drain of the MOS transistor Q1 in resistance-capacitance delay driving and a common end of a resistor R7, and a zener diode D6 is connected with a gate and a source of the MOS transistor Q2 in parallel.

The holding coil control module 5 comprises a holding coil L2 connected with the common end of the starting coil L1 and the MOS tube Q2, the other end of the holding coil L2 is connected with the MOS tube Q3 in series, the MOS tube Q3 and the source of the MOS tube Q2 are connected with the same ground, namely the MOS tube Q2 is connected with two ends of a series circuit formed by the holding coil L2 and the MOS tube Q3 in parallel, and the grid electrode of the MOS tube Q3 is connected with the proportional voltage division driving module 4.

Unlike embodiment 1, the circuit provided in this embodiment has a dual-coil serial structure, and the start coil L1 and the hold coil L2 operate in series when entering the energy saving mode, thereby forming a dual-coil serial structure. The starting coil L1 and the holding coil L2 are both connected in parallel with a coil bleed circuit, which includes a zener diode and an anti-parallel diode.

And (3) starting: the proportional voltage division driving module 4 drives the holding coil L2 and the MOS tube Q3 to form a loop to be conducted; meanwhile, a resistor R1 of the RC delay charging circuit starts to charge a capacitor C2, the charging voltage is used as a gate driving voltage of a delay switch MOS tube Q1, the initial voltage is 0, the MOS tube Q1 is turned off, the MOS tube Q1 and a resistor R7 form a circuit to drive the MOS tube Q2 to be turned on, so that a starting coil L1 works, meanwhile, the voltage of the two ends of the turned-on MOS tube Q2 is the same as the voltage of the two ends of a holding coil L2 and an MOS tube Q3 series circuit and is about dozens of mV, at the moment, although the L2 and the MOS tube Q3 series circuit have a conducting condition, the voltage of the two ends is only dozens of mV and is approximately short-circuited, the whole circuit only starts a coil L1 to work, so that a single coil is started, the current is the maximum, the power consumption is high, the electromagnetic attraction is the maximum, and the reliable attraction of contacts is ensured before the RC delay time is over.

Switching the state: the capacitor C2 in the resistance-capacitance delay charging circuit is continuously charged, when the delay time is reached, the voltage at the end of the capacitor C2 is higher than the grid starting voltage of the MOS tube Q1, the MOS tube Q1 is conducted, the circuit formed by the capacitor C2 and the resistor R7 drives the MOS tube Q2 to be switched off, the short-circuit state of a series loop of the holding coil L2 and the MOS tube Q2 disappears, the short-circuit state and the starting coil L1 form series work, and the circuit is switched from the starting state to the energy-saving holding state. Energy-saving state: the contact is in a holding state, the coil current is small, the power consumption of the coil is low, but the contact can be maintained in a reliable contact state, and the effect of energy conservation is achieved. When the power supply is in a power-off state: and when the two coils connected in series lose power, the contact is switched off.

In order to achieve the capability of suppressing the reverse voltage of the coil when the coil is powered off, in the start coil control module 3 and the hold coil control module 5 of the present embodiment, coil bleed circuits are respectively designed at two ends of the ports of the start coil L1 and the hold coil L2, and in the present embodiment, the coil bleed circuits include a zener diode D7 and an anti-parallel diode D8 connected in parallel with the start coil L1, and a zener diode D9 and an anti-parallel diode D10 connected in parallel with the hold coil L2. Meanwhile, the characteristic of the structure of the double-coil series circuit is considered, and when the first discharging loop cannot be discharged completely, the second coil discharging loop is added. Specifically, in the double-coil series structural circuit, the second coil bleed circuit 42 is connected in parallel with a series circuit composed of a start coil L1 and a holding coil L2, the second coil bleed circuit includes a zener diode D13 and an anti-parallel diode D14, one end of the zener diode D13 is connected with the start coil L1, the other end of the zener diode D13 is connected with one end of an anti-parallel diode D14, and the other end of the anti-parallel diode D14 is connected with the holding coil L2. Further realize back pressure inhibit function, reduce the condition that the contact draws the arc, reduce the contact and bounce the number of times, prolong the life-span of relay or contactor.

In summary, in one or more embodiments, the circuit realizes the reliable on/off capability of a product under the external characteristic of a complex power supply, reduces the interference influence of the back voltage of the double coils on an external control circuit, realizes quick off, reduces the arc discharge of the contact, and greatly prolongs the service life of a relay or a contactor; the circuit has realized that parallelly connected twin coil starts and the twin coil of establishing ties keeps two kinds of energy-conserving circuits structurally, satisfies the energy-conserving control of the coil structure of different relays or contactors, under the outer characteristic circumstances of bad power, realizes the function of reliable work, has reduced the design degree of difficulty and the cost of coil structure under the restriction design condition, and the technological effect who reaches has:

1. when the double-coil parallel starting or the single-coil starting is carried out, the power consumption is high, the current is the largest, the electromagnetic attraction is the largest, the contact is ensured to be reliably attracted before the resistance-capacitance delay time is over, and the low-power consumption state of single-coil maintaining or double-coil series maintaining is switched after the resistance-capacitance delay time is over, so that the purpose of energy saving is realized. When the power supply voltage VCC is higher than the rated voltage, the current of the coil is increased, the electromagnetic attraction is increased, the contact can be attracted in a short time, and simultaneously, the RC delay is shortened due to the increase of the voltage, so the electrifying time of the starting coil is shortened, the starting coil can better and quickly enter a low-power-consumption working state, and the starting power of the relay or the contactor is further dynamically reduced; when the power supply voltage VCC is lower than the rated voltage, the current is reduced, and simultaneously, the RC delay is prolonged due to the reduction of the voltage, the electrifying time of the starting coil is prolonged, and the influence of insufficient suction force and unreliable suction of the contact caused by the reduction of the coil current is further reduced. The circuit further realizes dynamic adjustment of starting power consumption, realizes energy conservation and ensures reliable pull-in under different power supply characteristics.

2. The delay circuit is realized under the condition of slow boosting through the resistance-capacitance charging delay circuit, proper device parameters are selected, proper abnormal starting voltage is set, when the voltage is smaller than the abnormal starting voltage, the starting coil L1 continuously keeps working until the abnormal voltage disappears, the relay or the contactor is promoted to have the capability of reliably attracting a contact under the abnormal voltage, and the functional failure caused by the fact that the starting coil L1 cannot work is avoided;

3. when the power supply step signal is switched, when the switching interval time is less than RC resistance-capacitance delay time, the normal work of the starting coil L1 can be realized under the application situation of quick switching, the contact can be reliably attracted, and the functional failure is avoided;

4. the coil leakage loop is used for inhibiting the starting coil L1 and the holding coil L2 from generating reverse voltage in the outage time, so that the function of inhibiting the back voltage is realized, the contact turn-off time of the relay or the contactor is shortened, the contact bounce times are reduced, the condition of contact arc discharge caused by the reasons is reduced, and the service life of the relay or the contactor is greatly prolonged.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims (10)

1. The utility model provides an energy-saving relay or contactor control circuit which characterized in that: the device comprises an input and protection module (1) for rectifying, filtering and preventing surge of a power supply signal VCC, a resistance-capacitance delay driving module (2) sequentially connected with the output end of the input and protection module (1), a starting coil control module (3) connected with a starting coil L1, a proportional voltage division driving module (4) and a holding coil control module (5) connected with a holding coil L2; the resistance-capacitance delay driving module (2) and the starting coil control module (3) are used for controlling the starting coil L1 to realize the switching of the starting state, the switching state and the holding state of a relay or a contactor, and the proportional voltage division driving module (4) controls the conduction state of the holding coil control module (5).

2. The power saving relay or contactor control circuit of claim 1, wherein: the input and protection module (1) comprises a diode D1, a transient suppression diode TVS, and a capacitor C1; diode D1 one end connect supply signal VCC, the other end respectively with transient suppression diode TVS with electric capacity C1 connects, transient suppression diode TVS with electric capacity C1's the other end ground connection.

3. The power saving relay or contactor control circuit of claim 1, wherein: the resistance-capacitance delay driving module (2) comprises a resistor R7 connected with the output end of the input and protection module (1) and an MOS transistor Q1 connected in series with the resistor R7, a resistance-capacitance charging delay circuit connected with the grid electrode of the MOS transistor Q1 and a quick reset circuit connected with the resistance-capacitance charging delay circuit, wherein the resistance-capacitance charging delay circuit controls the MOS transistor Q1 to be switched on and switched off; the resistor R7 and a MOS tube Q1 are connected with the starting coil control module (3).

4. The power saving relay or contactor control circuit of claim 3, wherein: the resistance-capacitance charging delay circuit comprises a resistor R1 connected with the output end of the input and protection module (1), a capacitor C2 connected with the resistor R1 in series through a diode D3, a resistor R5 connected with the two ends of the capacitor C2 in parallel and a voltage stabilizing diode D4; the diode D3 and the capacitor C2, the common terminal of the zener diode D4 and the resistor R5 are connected with the gate of the MOS tube Q1 through the zener diode D5 and the resistor R6 which are connected in series, and the other ends of the capacitor C2, the zener diode D4 and the resistor R5 and the source of the MOS tube Q1 are grounded.

5. The power saving relay or contactor control circuit of claim 4, wherein: the fast reset circuit comprises the diode D3, a resistor R3, a triode V1 and a resistor R4 which are connected in parallel with two ends of the capacitor C2; the base electrode of the triode V1 is connected with the resistor R3; one end of the diode D3 is connected with the resistor R1 and the emitter of the triode V1, and the other end of the diode D3 is connected with the capacitor C2.

6. The power saving relay or contactor control circuit of claim 5, wherein: the starting coil control module (3) comprises a starting coil L1 and a MOS tube Q2, wherein the starting coil L1 is connected with the output end of the input and protection module (1); the other end of the starting coil L1 is connected in series with the drain electrode of the MOS transistor Q2; the gate of the MOS transistor Q2 is connected with the drain of the MOS transistor Q1 and the common end of the resistor R7, and the voltage stabilizing diode D6 is connected with the gate and the source of the MOS transistor Q2 in parallel.

7. The power saving relay or contactor control circuit of claim 6, wherein: the holding coil control module (5) comprises a holding coil L2 connected with the output end of the input and protection module (1) and a MOS transistor Q3 connected with the holding coil L2 in series, and the holding coil L2 is connected with the drain electrode of the MOS transistor Q3; the gate of the MOS transistor Q3 is connected with the proportional voltage division driving module (4).

8. The power saving relay or contactor control circuit of claim 7, wherein: the proportional voltage division driving module (4) comprises a resistor R8 and a resistor R9 which are connected in series, and diodes D12 and D11; one end of the resistor R8 is connected with the input and protection module (1), the other end of the resistor R8 is connected with the resistor R9, the common point of the resistor R8 is connected with the grid of the MOS transistor Q3 through the diode D12, and the diode D11 is connected with the grid and the source of the MOS transistor Q3 in parallel.

9. The power saving relay or contactor control circuit of claim 7, wherein: the start coil L1 is connected in parallel with the hold coil L2; the start coil L1 and the hold coil L2 are both connected in parallel with a coil bleed circuit; the coil bleed circuit includes a zener diode and an anti-parallel diode.

10. The power saving relay or contactor control circuit of claim 7, wherein: the start coil L1 is connected in series with the hold coil L2; coil bleeder circuits are connected in parallel at two ends of the starting coil L1 and the holding coil L2; the coil leakage loop comprises a voltage stabilizing diode and an anti-parallel diode, after the starting coil L1 and the holding coil L2 are connected in series, a second coil leakage loop is connected in parallel between one end of the starting coil L1 and one end of the holding coil L2.

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