Relay circuit and relay

Abstract

The utility model discloses a relay circuit and a relay, and the relay circuit comprises a sampling circuit which is used for collecting an input voltage; the input end of the direct-current conversion circuit is connected with the output end of the sampling circuit; the input end of the time delay circuit is connected with the output end of the direct current conversion circuit; one input end of the comparison circuit is connected with the output end of the time delay circuit, and the other input end of the comparison circuit is connected with reference voltage; the switch is provided with an input loop and an output loop, the output end of the comparison circuit is connected into the input loop of the switch, the on-off state of the output loop of the switch is controlled by the input loop of the switch, and the output loop of the switch is used for being connected with a load. According to the relay circuit, the response time of the relay to the input control signal can be adjusted to meet the requirements of different relay application scenes, and the relay circuit can be matched with electronic components in a simulation circuit, can be built in the simulation circuit at the same time, and facilitates debugging of design parameters of the relay.

Description

Technical Field

[0001] The utility model relates to a relay circuit. Background Art

[0002] Relay is an automatic switching element with isolation function. It is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment. It is one of the important control elements.

[0003] As is known, electromagnetic relays realize the conduction or disconnection of controlled circuits by controlling the closing and opening of moving contacts and static contacts. With the advancement of science and technology, various new electrical equipment emerge in an endless stream. These new electrical equipment often need to be connected to different power supply systems, and different equipment has different requirements for relays. Therefore, it is necessary to design more types of relays to meet the needs of different equipment.

[0004] The circuits of electrical equipment will be simulated and debugged before production. As one of the electronic components in the circuits of electrical equipment, relays will inevitably involve parameter debugging. Existing relay circuits often cannot match the relay circuits in the simulation circuits, resulting in the problem that the design of complex models is difficult to implement. Summary of the invention

[0005] The present invention aims at the technical problem that the relay circuit structure in the prior art is not conducive to production debugging, and proposes a relay circuit that can solve the above problem.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A relay circuit comprising:

[0008] A sampling circuit, which is used to collect input voltage;

[0009] A DC conversion circuit, whose input end is connected to the output end of the sampling circuit;

[0010] A delay circuit, whose input end is connected to the output end of the DC conversion circuit;

[0011] A comparison circuit, wherein one input terminal of the comparison circuit is connected to the output terminal of the delay circuit, and another input terminal of the comparison circuit is connected to a reference voltage;

[0012] The switch has an input circuit and an output circuit. The output end of the comparison circuit is connected to the input circuit of the switch. The on-off state of the output circuit of the switch is controlled by the input circuit. The output circuit of the switch is used to connect a load.

[0013] In some embodiments, the sampling circuit includes a sampling resistor, two ends of the sampling resistor are respectively connected to a first sampling input terminal and a second sampling input terminal, and the first sampling input terminal and the second sampling input terminal are respectively used to receive a control signal;

[0014] The DC conversion circuit has two input terminals, and the two input terminals of the DC conversion circuit are respectively connected to two ends of the sampling resistor.

[0015] In some embodiments, the DC conversion circuit is a voltage-controlled voltage source, and two input terminals of the voltage-controlled voltage source are respectively connected to two ends of the sampling resistor;

[0016] The voltage-controlled voltage source has two output terminals, one of the output terminals of the voltage-controlled voltage source is connected to the input terminal of the delay circuit, and the other output terminal of the voltage-controlled voltage source is connected to the ground terminal;

[0017] The voltage-controlled voltage source amplifies the input voltage and outputs it to the delay circuit.

[0018] In some embodiments, the delay circuit includes a second resistor and a first capacitor, the first end of the second resistor is the input end of the delay circuit, and the first end of the second resistor is connected to the output end of the DC conversion circuit, the second end of the second resistor is the output end of the delay circuit, and the second end of the second resistor is connected to the ground through the first capacitor.

[0019] In some embodiments, the comparison circuit includes a comparator, wherein the non-inverting input terminal of the comparator is connected between the second resistor and the first capacitor, the inverting input terminal of the comparator is connected to a reference voltage, the two output terminals of the comparator are respectively connected to the two ends of the input loop of the switch, and one of the output terminals of the comparator is connected to the ground.

[0020] In some embodiments, the delay circuit includes a delay chip, the input end of the delay chip is connected to the output end of the DC conversion circuit, one of the input ends of the comparison circuit is connected to the output end of the delay chip, and the delay chip is used to delay the input signal and output a delayed signal to the back end.

[0021] In some embodiments, a coil is provided in the input circuit of the switch, a moving contact and a stationary contact are provided in the output circuit, and the connection state of the moving contact and the stationary contact is controlled by the input voltage in the coil.

[0022] In some embodiments, when the voltage across the first capacitor is charged to a value greater than a reference voltage, the comparison circuit outputs a high level, and the coil pulls the moving contact and the static contact together;

[0023] When the voltage across the first capacitor is charged to a value not greater than a reference voltage, the comparison circuit outputs a low level, and the moving contact and the static contact are disconnected.

[0024] In some embodiments, the resistance value of the sampling circuit, the reference voltage of the comparison circuit, the gain of the DC conversion circuit, and the delay time of the delay circuit are all adjustable.

[0025] The utility model also proposes a relay, which includes a relay circuit, and the relay circuit includes:

[0026] A sampling circuit, which is used to collect input voltage;

[0027] A DC conversion circuit, whose input end is connected to the output end of the sampling circuit;

[0028] A delay circuit, whose input end is connected to the output end of the DC conversion circuit;

[0029] A comparison circuit, wherein one input terminal of the comparison circuit is connected to the output terminal of the delay circuit, and another input terminal of the comparison circuit is connected to a reference voltage;

[0030] A switch having an input circuit and an output circuit, wherein the output end of the comparison circuit is connected to the input circuit of the switch, the on-off state of the output circuit of the switch is controlled by the input circuit, and the output circuit of the switch is used to connect a load;

[0031] The relay circuit is packaged as an integrated component, and the integrated component has a first sampling input terminal, a second sampling input terminal and two output terminals for connecting to an external circuit.

[0032] Compared with the prior art, the advantages and positive effects of the present invention are:

[0033] The relay circuit of the utility model is provided with a sampling circuit for collecting a voltage signal for controlling the relay, and the voltage signal is amplified by a DC conversion circuit and output to a delay circuit, the delay circuit is used to output the amplified control signal after delay, and can adjust the response time of the relay to the input control signal to adapt to meet the needs of different relay application scenarios, the comparison circuit compares the input voltage signal with the reference voltage, and the comparison result is used to control the on-off state of the output circuit of the switch. The relay circuit can meet the use requirements of different scenarios, the electronic components used to build the circuit are commonly used components, and can match the electronic components in the simulation circuit, and can be built in the simulation circuit at the same time, which is convenient for debugging the relay design parameters.

[0034] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a principle block diagram of an embodiment of the relay circuit proposed by the utility model;

[0037] Figure 2 It is a circuit principle diagram of an embodiment of the relay circuit proposed by the utility model;

[0038] Figure 3 It is a schematic diagram of a time delay circuit in one embodiment of a relay circuit proposed by the utility model;

[0039] Figure 4 It is a schematic diagram of a comparison circuit in one embodiment of the relay circuit proposed by the utility model;

[0040] Figure 5 It is a schematic diagram of a switch circuit in one embodiment of the relay circuit proposed by the utility model;

[0041] Figure 6 It is a schematic diagram of the packaging principle of an embodiment of the relay circuit proposed by the utility model;

[0042] Figure 7 It is a schematic diagram of the simulation circuit principle in one embodiment of the relay circuit proposed by the utility model;

[0043] Figure 8 It is a schematic diagram of an input waveform and an output waveform of a relay circuit proposed by the utility model in one embodiment;

[0044] Fig. 9 It is a schematic diagram of an input waveform and an output waveform of a relay circuit proposed by the utility model in another embodiment;

[0045] Fig.10 This is a circuit principle diagram of another embodiment of the relay circuit proposed by the utility model. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are merely for the convenience of description and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Embodiment 1: A relay is an automatic switching element with an isolation function, and its core function is to use a small current to control a large current, thereby realizing the on-off switching of a circuit and automatically adjusting the on-off state of the circuit.

[0050] As an electrical control device, the working principle of the relay is: when the change of the input quantity (excitation quantity) reaches the specified requirement, it is an electrical appliance that causes the controlled quantity to undergo a predetermined step change in the electrical output circuit. When the input quantity drops to a certain level and remains for a long enough time, it returns to the initial state. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is usually used in automated control circuits.

[0051] Relays generally have a sensing mechanism (located in the input circuit) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.) and an actuator (located in the output circuit) that can control the "on" and "off" of the controlled circuit.

[0052] Between the input and output parts of the relay, there is an intermediate mechanism (driving part) that couples and isolates the input quantity, processes functions, and drives the output part.

[0053] There are two types of relay output circuits: normally closed contacts and normally open contacts. When the input quantity changes to the specified requirements, the normally closed contacts close and the normally open contacts open.

[0054] When the input quantity drops to a certain level and remains long enough, the normally closed contact opens and the normally open contact closes.

[0055] Relays are widely used in automation control circuits, such as automated production lines, household appliances, etc., for functions such as automatic adjustment, safety protection and circuit conversion.

[0056] With the emergence of various new electrical equipment, these new electrical equipment often need to be connected to different power supply systems, and different electrical equipment have different requirements for relays. Electrical equipment circuits will be simulated and debugged before manufacturing. As one of the electronic components of electrical equipment circuits, relays will inevitably involve parameter debugging. Existing relay circuits often cannot match the relay circuits in the simulation circuits, resulting in the problem that the design of complex models is difficult to implement.

[0057] Based on the above, this embodiment proposes a relay circuit, such as Figure 1 As shown, it includes a sampling circuit, which is used to collect the voltage of the input signal, that is, the input voltage. The input signal is generally a control signal, which is used to control the on-off state of the switch of the relay.

[0058] A relay generally controls a large current signal with a small current signal, that is, the input control signal is weak. In order to improve the driving ability of the small current control signal, in some embodiments, the relay circuit also includes a DC conversion circuit, and the input end of the DC conversion circuit is connected to the output end of the sampling circuit. The sampling circuit outputs the sampled voltage signal to the DC conversion circuit. The DC conversion circuit is used to amplify the voltage signal sampled by the sampling circuit, and its amplification factor is x.

[0059] In some embodiments, the gain of the DC conversion circuit is controllable and adjustable, and can be adjusted according to actual needs of the relay application scenario.

[0060] In various protection and automatic control circuits operated by DC or AC, it is often necessary to delay the input control signal. Adding the delay function to the relay circuit and increasing the function of the relay is conducive to expanding the application field and adaptation range of the relay. In some embodiments, the relay circuit also includes a delay circuit, the input end of the delay circuit is connected to the output end of the DC conversion circuit, the delay circuit delays the signal output by the DC conversion circuit and outputs it to the back-end circuit, and the delay circuit can adjust the power-on delay or power-off delay time as needed.

[0061] In some embodiments, the relay circuit further includes a comparison circuit, one of the input terminals of the comparison circuit is connected to the output terminal of the delay circuit, and the other input terminal of the comparison circuit is connected to the reference voltage. The comparison circuit compares the signal output by the delay circuit with the reference voltage and outputs the comparison result, and the comparison result is used to control the electronic components at the rear end thereof. The reference voltage input to the comparison circuit is the minimum operating voltage, and the sensitivity of the relay can be adjusted by adjusting the reference voltage.

[0062] In some embodiments, such as Figure 1 , Figure 2 As shown, the relay circuit also includes a switch S1, which has an input circuit and an output circuit. The output end of the comparison circuit is connected to the input circuit of the switch S1, and the on-off state of the output circuit of the switch S1 is controlled by its input circuit. The output circuit of the switch S1 is used to connect the load, and the on or off of the output circuit of the switch S1 realizes the on or off of the load in the circuit.

[0063] The comparison circuit outputs the comparison result to the input circuit of the switch S1 as an excitation quantity. When the comparison result reaches the specified requirement, the output circuit of the switch S1 circuit jumps to achieve a change from on to off, or from off to on. The output circuit of the switch S1 circuit is connected to the load, thereby finally achieving the connection or disconnection of the load in the circuit.

[0064] In some embodiments, the sampling circuit includes a sampling resistor R1, and both ends of the sampling resistor R1 are respectively connected to a first sampling input terminal and a second sampling input terminal, and the first sampling input terminal and the second sampling input terminal are respectively used to receive control signals. The first sampling input terminal and the second sampling input terminal serve as interface terminals for connecting an external control circuit, and the input control signal forms a voltage drop when passing through the sampling resistor R1, that is, a sampling voltage, and is sent to a DC conversion circuit located at the back end of the sampling circuit.

[0065] In some embodiments, the sampling resistor R1 may be a single resistor, or a resistor circuit formed by connecting a plurality of resistors in series and / or in parallel. The resistance value of the sampling resistor R1 may be adjusted according to actual needs.

[0066] It is understandable that in order to adjust the resistance of the sampling resistor R1, a controllable switch S1 capable of controlling the on / off state of the corresponding branch can be provided in the series or parallel circuit of the resistor, for example, a transistor or MOS transistor can be used. By controlling the on / off state of the controllable switch S1, the connection state of the series or resistor can be controlled, and the resistance of the sampling resistor R1 can be adjusted.

[0067] The DC conversion circuit has two input terminals, and the two input terminals of the DC conversion circuit are respectively connected to two ends of the sampling resistor R1.

[0068] In this embodiment, a sampling circuit is provided to collect a voltage signal for controlling a relay, and the voltage signal is amplified via a DC conversion circuit and output to a delay circuit. The delay circuit is used to output the amplified control signal after delay, and can adjust the response time of the relay to the input control signal to adapt to meet the needs of different relay application scenarios. The comparison circuit compares the input voltage signal with the reference voltage, and the comparison result is used to control the on-off state of the output circuit of the switch S1. This relay circuit can meet the use requirements of different scenarios. The electronic components used to build the circuit are commonly used devices and can match the electronic components in the simulation circuit. They can be built in the simulation circuit at the same time, which is convenient for debugging the relay design parameters.

[0069] In some embodiments, the resistance value of the sampling circuit, the reference voltage of the comparison circuit, the gain of the DC conversion circuit, and the delay time of the delay circuit are all adjustable.

[0070] In some embodiments, such as Figure 2 As shown, the DC conversion circuit is a voltage-controlled voltage source E1, and the two input ends of the voltage-controlled voltage source E1 are respectively connected to the two ends of the sampling resistor R1. When the input control signal passes through the sampling resistor R1, a voltage drop is formed, that is, the sampling voltage, and is sent to the voltage-controlled voltage source E1 located at the back end of the sampling circuit. The voltage-controlled voltage source E1 is used to amplify the sampling voltage and output it, and the amplification factor of the voltage-controlled voltage source E1 is adjustable.

[0071] The voltage-controlled voltage source E1 also exists in the simulation system and can match the actual circuit.

[0072] In some embodiments, the voltage-controlled voltage source E1 has two output terminals, one of which is connected to the input terminal of the delay circuit, and the other of which is connected to the ground terminal. The voltage-controlled voltage source E1 outputs the amplified voltage signal to the delay circuit at its rear end.

[0073] The voltage-controlled voltage source E1 amplifies the input voltage and outputs it to the delay circuit. The voltage-controlled voltage source E1 improves the driving capability of the control signal by amplifying the voltage value of the control signal.

[0074] In some embodiments, such as Figure 3 As shown, the delay circuit includes a second resistor R2 and a first capacitor C1, the first end of the second resistor R2 is the input end of the delay circuit, and the first end of the second resistor R2 is connected to the output end of the DC conversion circuit, the second end of the second resistor R2 is the output end of the delay circuit, and the second end of the second resistor R2 is connected to the ground end through the first capacitor C1.

[0075] The delay circuit has a simple and effective structure. When the level of VIN changes from low to high, the first capacitor C1 starts to charge through the second resistor R2, and the charging time constant is = R2*C1. After several times of the time constant, the voltage of the first capacitor C1 reaches the steady-state VIN. The purpose of adjusting the delay time of the delay circuit is achieved by adjusting the charging time constant.

[0076] The second resistor R2 and the first capacitor C1 together form an RC filter circuit, which can filter out noise in the signal. At the same time, another function of this embodiment is charging to achieve a delay effect, and the delay parameter is adjustable.

[0077] In some embodiments, the delay circuit can also be implemented by a delay chip, the input end of the delay chip is connected to the output end of the DC conversion circuit, one of the input ends of the comparison circuit is connected to the output end of the delay chip, and the delay chip is used to delay the input signal and then output the delayed signal to the back end. The delay chip is used to delay the input signal according to the set delay time to achieve a delay effect.

[0078] In some embodiments, such as Figure 4 As shown, the comparison circuit includes a comparator E2, a non-inverting input terminal of the comparator E2 is connected between the second resistor R2 and the first capacitor C1, an inverting input terminal of the comparator E2 is connected to a reference voltage, two output terminals of the comparator E2 are respectively connected to two ends of an input loop of the switch S1, and one of the output terminals of the comparator E2 is connected to the ground.

[0079] In some embodiments, such as Figure 5 As shown, a coil is provided in the input circuit of the switch S1, and a moving contact (connected to the output terminal OUT2) and a stationary contact (connected to the output terminal OUT1) are provided in the output circuit. The connection state of the moving contact and the stationary contact is controlled by the input voltage in the coil.

[0080] In some embodiments, the logic when the relay is closed: when the first sampling input terminal IN1 of the relay = VIN1 and the second sampling input terminal IN2 = VIN2, the voltage at the sampling input terminal of the DC conversion circuit E1 is amplified to x times the input voltage, and then input into the RC filter circuit composed of the second resistor R2 and the first capacitor C1 to charge the first capacitor C1. When the voltage across the first capacitor C1 is charged to Vc1 > V1, the comparator E2 outputs a high level, the switch S1 closes, and the two output terminals, namely the OUT1 output terminal and the OUT2 output terminal, conduct, so the output circuit of the relay conducts.

[0081] The logic when the relay is open: when the first sampling input terminal IN1 of the relay = VIN11 and the second sampling input terminal IN2 = VIN22, the voltage at the sampling input terminal of the DC conversion circuit E1 is amplified to x times the input voltage, and then input into the RC filter circuit composed of the second resistor R2 and the first capacitor C1. At this time, the first capacitor C1 discharges. When the voltage across the first capacitor C1 discharges to Vc1 < V1, the comparator E2 outputs a low level, the switch S1 opens, and the two output terminals, namely the OUT1 output terminal and the OUT2 output terminal, disconnect, so the output circuit of the relay disconnects.

[0082] In some embodiments, when the voltage across the first capacitor C1 is charged to be greater than the reference voltage, the comparison circuit outputs a high level, and the coil attracts the moving contact and the stationary contact.

[0083] That is, when the relay input terminals IN1 = VIN1 and IN2 = VIN2, the voltage at the sampling input terminal of E1 is amplified to x times the input voltage, and then input into the RC filter circuit composed of R2 and C1 to charge C1. When the voltage across C1 is charged to Vc1 > V1, E2 outputs a high level, S1 closes, the coil attracts the moving contact and the stationary contact, and the OUT1 output terminal and the OUT2 output terminal conduct, that is, the output circuit of the relay conducts.

[0084] When the voltage across the first capacitor C1 is charged to be not greater than the reference voltage, the comparison circuit outputs a low level, and the moving contact and the stationary contact disconnect.

[0085] That is, when the first sampling input terminal IN1 of the relay = VIN11 and the second sampling input terminal IN2 = VIN22, the voltage at the sampling input terminal of the DC conversion circuit E1 is amplified to x times the input voltage, and then input into the RC filter circuit composed of the second resistor R2 and the first capacitor C1. At this time, the first capacitor C1 discharges. When the voltage across the first capacitor C1 discharges to Vc1 < V1, the comparator E2 outputs a low level, the switch S1 opens, the moving contact and the stationary contact disconnect, and the OUT1 output terminal and the OUT2 output terminal disconnect, that is, the output circuit of the relay disconnects.

[0086] Embodiment 2: This embodiment proposes another form of relay circuit, such as Fig.10 As shown, it includes a sampling circuit, which is used to collect the voltage of the input signal, that is, the input voltage. The input signal is generally a control signal, which is used to control the on-off state of the switch of the relay.

[0087] A relay generally controls a large current signal with a small current signal, that is, the input control signal is weak. In order to improve the driving ability of the small current control signal, in some embodiments, the relay circuit also includes a DC conversion circuit, and the input end of the DC conversion circuit is connected to the output end of the sampling circuit. The sampling circuit outputs the sampled voltage signal to the DC conversion circuit. The DC conversion circuit is used to amplify the voltage signal sampled by the sampling circuit, and its amplification factor is x.

[0088] In some embodiments, the gain of the DC conversion circuit is controllable and adjustable, and can be adjusted according to actual needs of the relay application scenario.

[0089] In various protection and automatic control circuits operated by DC or AC, it is often necessary to delay the input control signal. Adding the delay function to the relay circuit and increasing the function of the relay is conducive to expanding the application field and adaptation range of the relay. In some embodiments, the relay circuit also includes a delay circuit, the input end of the delay circuit is connected to the output end of the DC conversion circuit, the delay circuit delays the signal output by the DC conversion circuit and outputs it to the back-end circuit, and the delay circuit can adjust the power-on delay or power-off delay time as needed.

[0090] In some embodiments, the relay circuit further includes a comparison circuit, one of the input terminals of the comparison circuit is connected to the output terminal of the delay circuit, and the other input terminal of the comparison circuit is connected to the reference voltage. The comparison circuit compares the signal output by the delay circuit with the reference voltage and outputs the comparison result, and the comparison result is used to control the electronic components at the rear end thereof. The reference voltage input to the comparison circuit is the minimum operating voltage, and the sensitivity of the relay can be adjusted by adjusting the reference voltage.

[0091] In some embodiments, the relay circuit also includes a switch S1, which has an input circuit and an output circuit. The output end of the comparison circuit is connected to the input circuit of the switch S1, and the on-off state of the output circuit of the switch S1 is controlled by its input circuit. The output circuit of the switch S1 is used to connect the load, and the conduction or disconnection of the output circuit of the switch S1 realizes the connection or disconnection of the load in the circuit.

[0092] The comparison circuit outputs the comparison result to the input circuit of the switch S1 as an excitation quantity. When the comparison result reaches the specified requirement, the output circuit of the switch S1 circuit jumps to achieve a change from on to off, or from off to on. The output circuit of the switch S1 circuit is connected to the load, thereby finally achieving the connection or disconnection of the load in the circuit.

[0093] In some embodiments, the output circuit of the switch S1 circuit is further provided with an output resistor R3, and the output resistor R3 can be connected to any output terminal of the switch S1, for example, it can be connected to OUT1 or OUT2. The figure shows that the output resistor R3 is connected to OUT2 as an example.

[0094] The output resistor R3 is used to adjust the voltage and / or current of the load when the output loop of the switch S1 is turned on, so that the load works within a suitable voltage and / or current range, thereby protecting the load.

[0095] Embodiment three, this embodiment proposes a relay, which includes a relay circuit, and the relay circuit includes a sampling circuit, and the sampling circuit is used to collect the voltage of an input signal, that is, the input voltage. The input signal is generally a control signal, which is used to control the on-off state of the relay switch.

[0096] A relay generally controls a large current signal with a small current signal, that is, the input control signal is weak. In order to improve the driving ability of the small current control signal, in some embodiments, the relay circuit also includes a DC conversion circuit, and the input end of the DC conversion circuit is connected to the output end of the sampling circuit. The sampling circuit outputs the sampled voltage signal to the DC conversion circuit. The DC conversion circuit is used to amplify the voltage signal sampled by the sampling circuit, and its amplification factor is x.

[0097] In some embodiments, the gain of the DC conversion circuit is controllable and adjustable, and can be adjusted according to actual needs of the relay application scenario.

[0098] In various protection and automatic control circuits operated by DC or AC, it is often necessary to delay the input control signal. Adding the delay function to the relay circuit and increasing the function of the relay is conducive to expanding the application field and adaptation range of the relay. In some embodiments, the relay circuit also includes a delay circuit, the input end of the delay circuit is connected to the output end of the DC conversion circuit, the delay circuit delays the signal output by the DC conversion circuit and outputs it to the back-end circuit, and the delay circuit can adjust the power-on delay or power-off delay time as needed.

[0099] In some embodiments, the relay circuit further includes a comparison circuit, one of the input terminals of the comparison circuit is connected to the output terminal of the delay circuit, and the other input terminal of the comparison circuit is connected to the reference voltage. The comparison circuit compares the signal output by the delay circuit with the reference voltage and outputs the comparison result, and the comparison result is used to control the electronic components at the rear end thereof. The reference voltage input to the comparison circuit is the minimum operating voltage, and the sensitivity of the relay can be adjusted by adjusting the reference voltage.

[0100] In some embodiments, the relay circuit also includes a switch S1, which has an input circuit and an output circuit. The output end of the comparison circuit is connected to the input circuit of the switch S1, and the on-off state of the output circuit of the switch S1 is controlled by its input circuit. The output circuit of the switch S1 is used to connect the load, and the conduction or disconnection of the output circuit of the switch S1 realizes the connection or disconnection of the load in the circuit.

[0101] The comparison circuit outputs the comparison result to the input circuit of the switch S1 as an excitation quantity. When the comparison result reaches the specified requirement, the output circuit of the switch S1 circuit jumps to achieve a change from on to off, or from off to on. The output circuit of the switch S1 circuit is connected to the load, thereby finally achieving the connection or disconnection of the load in the circuit.

[0102] In some embodiments, such as Figure 6 As shown, the relay circuit is packaged as an integrated component, which has a first sampling input terminal IN1, a second sampling input terminal IN2 and two output terminals OUT1 and OUT2 for connecting to an external circuit.

[0103] In some embodiments, the first sampling input terminal IN1 , the second sampling input terminal IN2 , and the two output terminals OUT1 , OUT2 are provided with connection leads or welding pins for external connection to facilitate electrical connection with an external circuit.

[0104] In some embodiments, the relay circuit can be fully simulated and restored in the simulation model, and parameters such as the resistance value of the sampling circuit, the reference voltage of the comparison circuit, the amplification factor of the DC conversion circuit, and the delay time of the delay circuit are all adjustable.

[0105] In some embodiments, the target effect is achieved by adjusting any combination of parameters such as the resistance value of the sampling circuit, the reference voltage of the comparison circuit, the amplification factor of the DC conversion circuit, the delay time of the delay circuit, etc. to appropriate values ​​in the simulation model, which is used to guide the design and manufacture of relays in actual production.

[0106] In some embodiments, the relay circuit is connected to the control circuit of the electrical appliance in a simulation model, and any combination of parameters such as the resistance value of the sampling circuit, the reference voltage of the comparison circuit, the amplification factor of the DC conversion circuit, the delay time of the delay circuit, etc. are adjusted to appropriate values ​​to guide the selection of relays for the control circuit of the electrical appliance in actual production.

[0107] Embodiment 4: Figure 7 A simple circuit simulated using this model is shown in Figure 1. A square wave with an amplitude of 12V is applied to the relay input and the relationship between the relay input and output is measured.

[0108] Figure 8 and Fig. 9 The figure shows the simulation results using the model. The solid waveform is the waveform at the input end of the relay, and the dotted waveform is the waveform at the output end of the relay. The input waveform durations of 40ms and 50ms were tested respectively. According to the measured data, the action time of the relay is 10ms and the release time is 4.4ms.

[0109] A relay model was established in the above manner. This model can be used in any simulation venue and has a wide range of applications, which can provide guidance for future circuit principle design.

[0110] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0112] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A relay circuit, characterized in that: include: A sampling circuit, which is used to collect input voltage; A DC conversion circuit, whose input end is connected to the output end of the sampling circuit; A delay circuit, whose input end is connected to the output end of the DC conversion circuit; A comparison circuit, wherein one input terminal of the comparison circuit is connected to the output terminal of the delay circuit, and another input terminal of the comparison circuit is connected to a reference voltage; The switch has an input circuit and an output circuit. The output end of the comparison circuit is connected to the input circuit of the switch. The on-off state of the output circuit of the switch is controlled by the input circuit. The output circuit of the switch is used to connect a load.

2. The relay circuit according to claim 1, characterized in that: The sampling circuit comprises a sampling resistor, two ends of the sampling resistor are respectively connected to a first sampling input terminal and a second sampling input terminal, and the first sampling input terminal and the second sampling input terminal are respectively used to receive a control signal; The DC conversion circuit has two input terminals, and the two input terminals of the DC conversion circuit are respectively connected to two ends of the sampling resistor.

3. The relay circuit according to claim 2, characterized in that: The DC conversion circuit is a voltage-controlled voltage source, and two input terminals of the voltage-controlled voltage source are respectively connected to two terminals of the sampling resistor; The voltage-controlled voltage source has two output terminals, one of the output terminals of the voltage-controlled voltage source is connected to the input terminal of the delay circuit, and the other output terminal of the voltage-controlled voltage source is connected to the ground terminal; The voltage-controlled voltage source amplifies the input voltage and outputs it to the delay circuit.

4. The relay circuit according to claim 1, characterized in that: The delay circuit includes a second resistor and a first capacitor, the first end of the second resistor is the input end of the delay circuit, and the first end of the second resistor is connected to the output end of the DC conversion circuit, the second end of the second resistor is the output end of the delay circuit, and the second end of the second resistor is connected to the ground end through the first capacitor.

5. The relay circuit according to claim 4, characterized in that: The comparison circuit includes a comparator, wherein the non-inverting input terminal of the comparator is connected between the second resistor and the first capacitor, the inverting input terminal of the comparator is connected to a reference voltage, the two output terminals of the comparator are respectively connected to the two ends of the input loop of the switch, and one of the output terminals of the comparator is connected to the ground.

6. The relay circuit according to claim 1, characterized in that: The delay circuit includes a delay chip, the input end of the delay chip is connected to the output end of the DC conversion circuit, one of the input ends of the comparison circuit is connected to the output end of the delay chip, and the delay chip is used to delay the input signal and then output a delayed signal to the back end.

7. The relay circuit according to claim 5, characterized in that: The input circuit of the switch is provided with a coil, and the output circuit has a moving contact and a stationary contact, and the connection state of the moving contact and the stationary contact is controlled by the input voltage of the coil.

8. The relay circuit according to claim 7, characterized in that: When the voltage across the first capacitor is charged to a value greater than the reference voltage, the comparison circuit outputs a high level, and the coil pulls the moving contact and the static contact together; When the voltage across the first capacitor is charged to a value not greater than a reference voltage, the comparison circuit outputs a low level, and the moving contact and the static contact are disconnected.

9. The relay circuit according to claim 7, characterized in that: The resistance value of the sampling circuit, the reference voltage of the comparison circuit, the gain of the DC conversion circuit, and the delay time of the delay circuit are all adjustable.

10. A relay, characterized in that: A relay circuit is included, wherein the relay circuit includes: A sampling circuit, which is used to collect input voltage; A DC conversion circuit, whose input end is connected to the output end of the sampling circuit; A delay circuit, whose input end is connected to the output end of the DC conversion circuit; A comparison circuit, wherein one input terminal of the comparison circuit is connected to the output terminal of the delay circuit, and another input terminal of the comparison circuit is connected to a reference voltage; A switch having an input circuit and an output circuit, wherein the output end of the comparison circuit is connected to the input circuit of the switch, the on-off state of the output circuit of the switch is controlled by the input circuit, and the output circuit of the switch is used to connect a load; The relay circuit is packaged as an integrated component, and the integrated component has a first sampling input terminal, a second sampling input terminal and two output terminals for connecting to an external circuit.

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