CN102044379B - Relay control device - Google Patents

Abstract

A relay control device is provided with a relay control circuit connected to the output end of the controller, a DC power supply for powering the controller and the relay control circuit, the DC power supply is provided with a rectification circuit connected to the AC power supply, and the rectification circuit has two outputs There is a voltage-dividing power supply circuit composed of DC voltage-dividing components between the terminals, which includes a set of DC working power supply terminals for the relay control circuit, and a set of DC standby working power supply terminals for the controller; The control circuit is provided with a switch control relay connected to the DC working power supply, and a second switch transistor connected in parallel with the switch control relay, the base of the second switch transistor is connected to the DC standby working power supply through the first switch transistor with the opposite polarity, The base of the first switching transistor is connected to the output terminal of the controller, and is used for providing a conduction bias voltage for the second switching transistor. The invention can reduce the power consumption of the DC working power supply of the relay control circuit in the standby state, and has reliable operation.

Description

A relay control device

technical field

The invention belongs to an electric and electronic equipment, in particular to a relay control device.

Background technique

In the control device, the relay is often used as the executive control component. The input terminal of the relay control circuit is connected to the controller, and the output terminal is connected to the controlled object. The controller controls the work of the controlled object through the contacts of the relay. The DC operating voltage required by the general relay control circuit is different from that required by the controller, and is provided separately by the DC operating power supply. In some control occasions, the controlled object is usually in a waiting state and only works when the controller sends out a signal. For example, as shown in Figure 1, it is a control circuit for a remote control power socket, and the controller in the box is received by the remote control signal. The circuit JSMK and the decoding circuit IC1 are composed. The relay control circuit is mainly composed of the switch control transistor Q1 and the relay JD1 connected in series in its collector circuit. The contacts of the relay are connected in series in the AC output circuit of the controlled object - J3.

The weak point of this type of relay control device is: in the standby state, the parts in the DC working power supply circuit for supplying power to the relay (as shown in Fig. 1, the voltage regulator tube Z1 and The resistor R0) also has current flowing through it, so it consumes more electric energy.

Contents of the invention

The technical problem to be solved by the present invention is to provide a relay control device that consumes less electric energy in a standby state.

The technical solution for solving the above problems is: the present invention is provided with a relay control circuit connected to the output end of the controller, and a DC power supply for supplying power to the controller and the relay control circuit, and is characterized in that: the DC power supply is provided with an AC power supply Connected rectification circuit, a voltage-dividing power supply circuit composed of DC voltage-dividing components is provided between the two output terminals of the rectifier circuit, and the voltage-dividing power supply circuit includes a set of DC working power supply terminals for relay control A DC standby working power supply terminal for supplying power to the controller; the relay control circuit is provided with a switch control relay connected to the DC working power supply, and a second switch transistor connected in parallel with the switch control relay, and the base of the second switch transistor passes through The first switching transistor, which is opposite in polarity to the second switching transistor, is connected to the DC standby power supply, and the base of the first switching transistor is connected to the output terminal of the controller for providing conduction bias for the second switching transistor.

The DC voltage-dividing components forming the voltage-dividing power supply circuit may be regulator tubes and/or resistors.

The working principle of the present invention is:

In the working state, the controller outputs a working signal, so that the first switching transistor is cut off, and the second switching transistor is also cut off at the same time. The DC working power supplies power to the switch control relay, and controls the on-off of the controlled circuit through the relay contact;

In the standby state, the standby signal output by the controller turns on the first switch triode, and provides a conduction bias voltage for the second switch triode, so that the second switch transistor is saturated and turned on. At this time, the switch control relay is connected in parallel The second switch triode is short-circuited and stops working. At the same time, both ends of the DC working power supply are short-circuited, and the corresponding voltage dividing circuit has no current flow and does not consume power. In this way, in the standby state, only the voltage dividing circuit corresponding to the DC standby working power supply There is current flowing to supply power to the controller. The controller in the working state can send a working signal to the relay control circuit in the standby state at any time as needed. Once the relay control circuit in the standby state receives the working signal from the controller, it will The first and second switch triodes will be cut off, and the switch control relay will return to the connected working state.

In the present invention, the second switching transistor is connected in parallel with the switch control relay, and the first switching transistor controlled by the controller and opposite in polarity to the second switching transistor is used to provide the conduction bias voltage for the second switching transistor, and the opposite polarity The first switch triode can play the role of phase inversion and level shifting, so that the DC working power supply at both ends of the relay control circuit can be short-circuited in the standby state, so that the DC voltage dividing components in the corresponding power supply voltage dividing circuit are free. The current flows, does not consume electric energy, and enables the DC standby power supply to supply power to the controller normally, so that the controller is in a standby state where it can send control signals at any time, and the relay control circuit is in a standby state that can receive control signals at any time.

The invention can reduce the power consumption of the DC working power supply of the relay control circuit in the standby state, and has the advantages of reliable operation and low power consumption in the standby state.

Description of drawings

Fig. 1, the circuit diagram of the remote control power socket adopting the relay control circuit in the prior art

Fig. 2, block schematic diagram of the present invention

Fig. 3, the embodiment of the present invention adopts the circuit diagram of the remote control power socket of relay control circuit

Detailed ways

The present invention will be further described below in conjunction with the embodiment of FIG. 3 .

This example is a remote control power socket using a relay control circuit. Its relay control circuit, controller and DC power supply are installed in the casing. The casing is provided with an AC input plug and an AC output socket that can be connected to the AC power supply. The neutral end of the AC input plug and the neutral end of the AC output socket The live wire end of the AC input plug is connected to the live wire end of the AC output socket through the normally open contact of the relay JDQ, and the rectifier circuit of the DC power supply is electrically connected to the AC input plug.

Refer to Figure 3, J1 is the common neutral terminal of the N pole of the AC input plug and the N pole of the AC output socket, J2 is the L pole of the AC input plug, and J3 is the OUT terminal of the AC output socket, which controls the normally open of the relay JDQ through the switch The contact is connected with the L pole (J2) of the AC input plug.

The socket housing is provided with a controller (the circuit in the dotted box in Fig. 3), a relay control circuit connected to the controller, and a DC power supply circuit for supplying power to the controller and the relay control circuit.

The structure of the DC power supply circuit is: a bridge rectifier circuit connected to the AC power supply and composed of rectifier diodes D1-D4 is provided; Voltage component—composed of two voltage regulator tubes Z1 and Z2 connected in series in the same direction, the connection point of the two voltage regulator tubes is grounded, and one end of the two output terminals of the bridge rectifier circuit is grounded through the first voltage regulator tube Z1 to form a +5 volt DC to the ground Standby working power supply; the other end is grounded through the second regulator tube Z2 to form a DC working power supply with opposite polarity to ground of -24 volts.

Both ends of the first zener diode Z1 are connected in parallel with filter capacitors C3 and C5, and both ends of the second zener diode Z2 are connected in parallel with filter capacitors C4 and C6.

The AC power input circuit is connected in series with a current-limiting resistor R1 and a capacitor C1. Both ends of the capacitor C1 are connected in parallel with resistors R2 and R3 (220 kΩ) whose resistance is much larger than that of the current-limiting resistor R1 (100 Ω).

The structure of the relay control circuit is as follows: the two ends of the JDQ coil of the switch control relay are connected to the -24 volt DC operating power supply, and its normally open contacts are connected in series in the controlled J3 AC output circuit, and the second switch transistor Q2 is NPN type , connected in parallel with the switch control relay JDQ coil, its collector is grounded, and the emitter is connected to the other end of the DC power supply (-24 volts); the base of the second switching transistor Q2 is the same as the PNP type first switching transistor Q1 with the opposite polarity The collector is connected, the emitter of the first switching transistor Q1 is connected to the +5V DC standby working power terminal through the forwardly connected diode D5, and the base of the first switching transistor Q1 is connected to the controller.

Inside the dashed box is a controller, the controller is provided with a remote control signal receiving circuit for receiving baseband signals, and a decoding circuit connected to the output end of the remote control signal receiving circuit, the output end of the decoding circuit is connected to the first relay control circuit of the aforementioned A base connection of the switching transistor Q1;

Specifically: the input circuit of the remote control signal receiving circuit is a super-regenerative detection circuit composed of a triode Q3, which is connected to a baseband amplifier circuit composed of an operational amplifier 1C1A through a low-pass filter circuit composed of 1R5, 1C6, 1R6, and 1C6. The output end of the baseband amplifier circuit is connected to the decoding circuit through a pulse shaping circuit composed of an operational amplifier 1C1AB; the decoding circuit is composed of an integrated circuit HL0604E (U2) and peripheral circuits, and the output end of the pulse shaping circuit of the remote control signal receiving circuit is connected to its input end 16 pins , the control output terminal 4 pin is connected with the base of the first switching transistor Q1 of the relay control circuit.

Both the remote control signal receiving circuit and the decoding circuit of the controller are powered by +5 volt DC standby power supply.

Here's how this example works:

In the standby state, the +5V DC standby power supply supplies power to the remote control signal receiving circuit and the decoding circuit. Transistor Q2 is saturated and turned on, and the switch control relay JDQ coil is short-circuited, the relay does not work, the AC output circuit J3 is cut off by the normally open contact, and there is no AC output;

At this time, both ends of the first voltage regulator tube Z1 of the -24 volt DC working power supply are short-circuited by the second switching transistor Q2 , no current flows, and no power consumption occurs.

After the remote control signal receiving circuit receives the remote control work signal, it decodes and outputs a high level through the decoding circuit, the first switch transistor Q1 is cut off, and the second switch transistor Q2 is cut off, and the -24V DC working power is applied to both ends of the switch control relay JDQ coil , the AC output circuit J3 is connected by the closed normally open contact, and there is AC output.

Figure 1 shows the remote control power socket that adopts relay control in the prior art. When the circuit is in the standby state, the voltage regulator tube Z1 of the 24V DC working power supply also has current flowing, so the power consumption in the standby state is about 1W. In the embodiment of the present invention, in the standby state, the 24 volt operating power supply is short-circuited by the second switching transistor Q2, and the voltage regulator tube Z2 of the corresponding voltage divider circuit has no power supply flowing through it, and the alternating current is stepped down through the current limiting resistor R1 and the capacitor C1 , D1-D4 rectification, C3, C5 filtering, Z1 voltage stabilization, output +5 volt standby DC power supply, only consumes a small active power of about 0.2W (C1 does not consume active power), so it has power consumption in standby mode low pros.

In this example, the second voltage regulator tube Z2 can prevent the peak voltage from being too high, and the filter capacitors C4 and C6 connected in parallel with it can reduce the ripple, so that the pull-in of the switch control relay JDQ contacts is more stable and reliable.

Claims (6)

1. relay control device, be provided with the bang-bang circuit that is connected with controller output end, be the DC power supply of controller and bang-bang circuit power supply, it is characterized in that: described DC power supply is provided with the rectification circuit (D1-D4) that is connected with AC power, be provided with the partial pressure type power supply circuits that formed by dc partial voltage parts (Z1, Z2) between rectification circuit two outputs, the partial pressure type power supply circuits comprise that one group is the dc supply end of bang-bang circuit power supply, and one group is the direct current stand-by operation power end of controller power supply; Described bang-bang circuit is provided with and dc supply (V _SS) the switch control relay (JDQ) that connects, with the second switch triode (Q2) that is connected in parallel with switch control relay (JDQ), the second switch transistor base by with opposite polarity the first switch triode of second switch triode (Q1) and direct current stand-by operation power supply (V _DD) connect, the first switch triode (Q1) base stage is connected with controller output end, is used to second switch triode (Q2) that the conducting bias voltage is provided.

2. relay control device according to claim 1, it is characterized in that: the structure of described partial pressure type power supply circuits is: rectification circuit two outputs one end that is connected with AC power consists of described direct current stand-by operation power supply by the first voltage-stabiliser tube (Z1) ground connection; The other end consists of described dc supply by the second voltage-stabiliser tube (Z2) ground connection.

3. relay control device according to claim 2, it is characterized in that: described the first voltage stabilizing didoe (Z1) two ends and the first filter capacitor (C3, C5) are connected in parallel, and the second voltage stabilizing didoe (Z2) two ends and the second filter capacitor (C4, C6) are connected in parallel.

4. relay control device according to claim 2, it is characterized in that: described bang-bang circuit structure is: second switch triode (Q2) is the NPN type, be connected with switch control relay (JDQ) coils from parallel connection of coils, its grounded collector, emitter connect the other end of dc supply; Second switch triode (Q2) base stage is with being connected with its opposite polarity positive-negative-positive the first switch triode (Q1) collector electrode, the first switch triode (Q1) emitter is connected with direct current stand-by operation power end by the diode (D5) that forward connects, and the first switch triode (Q1) base stage is connected with controller.

5. according to claim 2,3 or 4 described relay control devices, it is characterized in that: described controller is provided with the remote signal receiving circuit for receiving baseband signal, with the decoding circuit that is connected with remote signal receiving circuit output, the decoding circuit output is connected with the base stage of first switch triode (Q1) of described bang-bang circuit.

6. relay control device according to claim 5, it is characterized in that: described bang-bang circuit, controller and DC power supply are contained in the housing, housing is provided with the interchange input plug that can be connected with AC power and exchanges output socket, the zero line side that exchanges input plug is connected with the zero line side that exchanges output socket, the live wire end that exchanges input plug is connected with the live wire end that exchanges output socket by the normally open contact of relay (JDQ), the rectification circuit of described DC power supply with exchange the input plug electrical connection.

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