Communication circuit of emergency power supply and conventional power supply

Abstract

The invention provides an emergency power supply and conventional power supply communication circuit, which comprises an emergency power supply, a conventional power supply, a data sending line and a data receiving line, and is characterized in that the data sending line and the data receiving line are connected with the conventional power supply through communication interfaces; the data sending line and the data receiving line share one connecting line with the direct-current power supply; the direct-current power supply is connected to the communication circuit after being rectified and filtered by the capacitor, so that double-wire communication is realized, connecting wires are few, and installation errors are avoided.

Description

Technical Field

[0001] The invention relates to the field of power supply devices, in particular to a communication circuit between an emergency power supply and a conventional power supply. Background Art

[0002] Electrical equipment is often equipped with emergency power supplies and regular power supplies. For example, LED lights can be equipped with emergency power supplies so that they can be used in an emergency during a power outage. The emergency power supply and regular power supply need to communicate with each other to adjust the power.

[0003] In the prior art, emergency power supplies and conventional power supplies generally communicate through some bus communications, and the communication lines and power lines are often set separately, so 4 or more connecting lines are required between the emergency power supply and the conventional power supply. Obviously, the large number of connecting lines will cause the problem of complex assembly, and the communication between emergency power supplies and conventional power supplies of different brands is often incompatible. Therefore, a communication circuit between the emergency power supply and the conventional power supply is urgently needed to solve the above problems. Summary of the invention

[0004] The present invention provides a solution to the technical problems in the prior art that there are too many communication connection lines between the emergency power supply and the conventional power supply, which are difficult to assemble and are often incompatible with each other.

[0005] Specifically, the present invention provides a communication circuit between an emergency power supply and a conventional power supply, including an emergency power supply and a conventional power supply, including a sending data circuit and a receiving data circuit connected to the emergency power supply, the sending data circuit and the receiving data circuit are connected to the conventional power supply through a communication interface; the sending data circuit and the receiving data circuit share a connecting line with a DC power supply; the DC power supply is connected to the communication circuit after capacitor rectification and filtering, and is connected to the communication interface.

[0006] Preferably, the data transmission line includes a first MOS tube (QP13) and a first transistor (QP8); the gate of the first MOS tube (QP13) is connected to the TX1 pin of the emergency power supply, the source is connected to the VDD power supply, and the drain is coupled to the base of the first transistor (QP8); the emitter of the first transistor (QP8) is grounded, the collector is connected in series with a first resistor (RP44) and then coupled to pin 2 of the communication interface (CON8), and is connected to a +12V power supply.

[0007] Preferably, a second resistor (RP38) is connected in parallel between the base and the emitter of the first transistor (QP8), and a first diode (DP8) and a first voltage regulator diode (ZD3) are connected in series in sequence between the collector of the first transistor (QP8) and the +12V power supply.

[0008] Preferably, the receiving data circuit includes a second MOS tube (QP12) and a second transistor (QP7); the gate of the second MOS tube (QP12) is coupled to pin 2 of the communication interface (CON8), the source is connected to a +12V power supply, and the drain is coupled to the base of the second transistor (QP7); the emitter of the second transistor (QP7) is connected to pin 1 of the communication interface (CON8), the collector is connected to the RX1 pin of the emergency power supply, and the third resistor (RP39) is connected in series and then connected to the VDD power supply.

[0009] Preferably, a fourth resistor (RP40) is connected in parallel between the base and the emitter of the second transistor (QP7). Preferably, the +12V power supply is coupled to pin 1 of the communication interface (CON8), and the first capacitor (CP26) is connected between the +12V power supply and the ground.

[0010] Preferably, it includes a second diode (DP7), the cathode of the second diode is coupled to the 2nd pin of the communication interface (CON8), and the anode is coupled to the collector of the third transistor (QP11); the emitter of the third transistor (QP11) is connected in series with the fifth resistor (RP59) and then coupled to the cathode of the third diode (DP6), the base is connected in series with the sixth resistor (RP58) and then grounded, and connected to the collector of the fourth transistor (QP10); the base of the fourth transistor (QP10) is connected between the fifth resistor (RP59) and the emitter of the third transistor (QP11), the emitter is coupled to the anode of the third diode (DP6), and is connected to a +12V power supply.

[0011] The beneficial effects of the present invention are as follows: compared with the prior art, the communication circuit between an emergency power supply and a conventional power supply provided by the present invention comprises an emergency power supply and a conventional power supply and a sending data line and a receiving data line connected to the emergency power supply, the sending data line and the receiving data line are connected to the conventional power supply through a communication interface; the sending data line and the receiving data line share a connecting line with a DC power supply; the DC power supply is connected to the communication circuit after capacitor rectification and filtering, and is connected to the communication interface, the DC power supply as a working power supply and a communication signal share a connecting line, two-wire communication is realized, the connecting lines are few, installation errors will not occur, and the present invention is suitable for communication between a variety of emergency power supplies and conventional power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a circuit block diagram of the present invention; Figure 2 is a communication circuit diagram of the present invention; DETAILED DESCRIPTION

[0013] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0014] See also Figure 1-2 The present invention provides a communication circuit between an emergency power supply and a conventional power supply, including an emergency power supply and a conventional power supply, including a sending data line and a receiving data line connected to the emergency power supply, wherein the sending data line and the receiving data line are connected to the conventional power supply through a communication interface; the sending data line and the receiving data line share a connecting line with a DC power supply; the DC power supply is connected to the communication circuit after capacitor rectification and filtering, and is connected to the communication interface, and the communication signal and the working power supply share a connecting line, which greatly reduces the number of connecting lines between the conventional power supply and the emergency power supply; usually, the communication circuit of the present invention is mounted on the emergency power supply, and when used with conventional power supplies of different models, it can be connected by simply replacing a plug matching the conventional power supply, so that it has high compatibility.

[0015] In a specific embodiment, Figure 2 As shown, the data transmission line includes a first MOS tube (QP13) and a first triode (QP8); the gate of the first MOS tube (QP13) is connected to the TX1 pin of the emergency power supply, the source is connected to the VDD power supply, and the drain is coupled to the base of the first triode (QP8); the emitter of the first triode (QP8) is grounded, and the collector is coupled to the 2nd pin of the communication interface (CON8) after being connected in series with the first resistor (RP44), and is connected to the +12V power supply at the same time; obviously, when the emergency power supply sends data to the conventional power supply, the signal enters the circuit through TX1, changes the on and off of the first MOS tube (QP13), and then changes the high and low levels of the first triode (QP8), thereby generating high and low level square waves at the PROG2 end, and the data can be read out through the conventional power supply at the 2nd pin of the communication interface (CON8).

[0016] Furthermore, if Figure 2 As shown, a second resistor (RP38) is connected in parallel between the base and emitter of the first transistor (QP8), and a first diode (DP8) and a first voltage regulator diode (ZD3) are connected in series between the collector of the first transistor (QP8) and the +12V power supply. The second resistor (RP38) can provide a stable bias current to reduce the change caused by temperature. The second resistor (RP38) forms a negative feedback to make the base current of the first transistor (QP8) more stable, because the voltage drop on the second resistor (RP38) can compensate for the influence of part of the temperature change, thereby keeping the collector current stable. The first diode (DP8) and the first voltage regulator diode (ZD3) also stabilize and protect the signal in the circuit, and at the same time realize voltage stability and current limiting to prevent the circuit components from being damaged by excessive voltage.

[0017] In a specific embodiment, Figure 2As shown, the receiving data circuit includes a second MOS tube (QP12) and a second triode (QP7); the gate of the second MOS tube (QP12) is coupled to pin 2 of the communication interface (CON8), the source is connected to a +12V power supply, and the drain is coupled to the base of the second triode (QP7); the emitter of the second triode (QP7) is connected to pin 1 of the communication interface (CON8), the collector is connected to the RX1 pin of the emergency power supply, and the third resistor (RP39) is connected in series with the VDD power supply. It can be seen that when the conventional power supply wants to send data to the emergency power supply, the data generates a high and low level through the PROG2 terminal, thereby changing the on and off of the second MOS tube (QP12), and then changing the switch of QP7, which will generate a square wave at the RX1 terminal. The emergency power supply can receive the data transmitted by the conventional power supply by reading this square wave.

[0018] In the above embodiment, TX1 and RX1 are both connected to corresponding pins on the main control chip of the emergency power supply.

[0019] Similarly, a fourth resistor (RP40) is connected in parallel between the base and emitter of the second transistor (QP7) to enhance the stability of the current in the circuit and accelerate the consumption of the base charge, so that the transistor switches from the on state to the off state more quickly, which helps to reduce the switching time and improve the switching speed and efficiency of the circuit.

[0020] In a specific embodiment, a +12V power supply is coupled to pin 1 of the communication interface (CON8), and a first capacitor (CP26) is connected between the +12V power supply and ground. The 12V DC power supply generated by rectification and filtering in the entire communication circuit increases the working power supply for the entire communication circuit, and is provided to a conventional power supply through pin 1 of the communication interface (CON8).

[0021] like Figure 2 As shown, in actual use, considering that the connecting line may be very long, in order to increase the load capacity of the circuit, in this embodiment, a second diode (DP7) is also included, the cathode of the second diode is coupled to the 2nd pin of the communication interface (CON8), and the anode is coupled to the collector of the third triode (QP11); the emitter of the third triode (QP11) is connected in series with the fifth resistor (RP59) and then coupled to the cathode of the third diode (DP6), the base is connected in series with the sixth resistor (RP58) and then grounded, and connected to the collector of the fourth triode (QP10); the base of the fourth triode (QP10) is connected between the fifth resistor (RP59) and the emitter of the third triode (QP11), the emitter is coupled to the anode of the third diode (DP6), and is connected to the +12V power supply; a constant current circuit is formed to provide a stable current to ensure stable operation of the communication circuit.

[0022] In this embodiment, when the mains power is disconnected, the emergency power supply will send a 4 Hz square wave signal to the conventional power supply, and the conventional power supply will switch to the emergency power supply after receiving the signal. When the mains power is normal, the emergency power supply will send a 1 Hz square wave signal to the conventional power supply, and the conventional power supply will switch to the conventional power supply after receiving the signal. In this embodiment, the duty cycle of the square wave signal is 20%.

[0023] The advantages of the present invention are: 1) The DC power supply and communication circuit share one connecting wire, which greatly reduces the number of connecting wires and reduces the difficulty of installation.

[0024] 2) A resistor is connected in parallel with the first transistor and the second transistor, and a diode and a voltage regulator diode are connected in series in the circuit to ensure the stability of the circuit current and signal.

[0025] 3) A constant current circuit is provided to make the voltage and current constant, thereby improving the load and stability of the circuit and allowing the length of the connecting line to be set longer.

[0026] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A communication circuit between an emergency power supply and a conventional power supply, comprising an emergency power supply and a conventional power supply, characterized in that: It includes a data transmission line and a data reception line connected to the emergency power supply, wherein the data transmission line and the data reception line are connected to the conventional power supply through a communication interface (CON8); the data transmission line and the data reception line share a connection line with the DC power supply; The DC power supply is connected to the communication circuit after being rectified and filtered by a capacitor, and is connected to the communication interface (CON8).

2. A communication circuit between an emergency power supply and a conventional power supply according to claim 1, characterized in that: The data transmission line comprises a first MOS tube (QP13) and a first transistor (QP8); the gate of the first MOS tube (QP13) is connected to the TX1 pin of the emergency power supply, the source is connected to the VDD power supply, and the drain is coupled to the base of the first transistor (QP8); the emitter of the first transistor (QP8) is grounded, the collector is connected in series with a first resistor (RP44) and coupled to pin 2 of the communication interface (CON8), and is connected to a +12V power supply.

3. A communication circuit between an emergency power supply and a conventional power supply according to claim 2, characterized in that: A second resistor (RP38) is connected in parallel between the base and emitter of the first transistor (QP8), and a first diode (DP8) and a first voltage regulator diode (ZD3) are connected in series in sequence between the collector of the first transistor (QP8) and the +12V power supply.

4. A communication circuit between an emergency power supply and a conventional power supply according to claim 1, characterized in that: The receiving data circuit comprises a second MOS tube (QP12) and a second triode (QP7); the gate of the second MOS tube (QP12) is coupled to pin 2 of the communication interface (CON8), the source is connected to a +12V power supply, and the drain is coupled to the base of the second triode (QP7); the emitter of the second triode (QP7) is connected to pin 1 of the communication interface (CON8), the collector is connected to the RX1 pin of the emergency power supply, and a third resistor (RP39) is connected in series and then connected to the VDD power supply.

5. A communication circuit between an emergency power supply and a conventional power supply according to claim 4, characterized in that: A fourth resistor (RP40) is connected in parallel between the base and the emitter of the second transistor (QP7).

6. A communication circuit between an emergency power supply and a conventional power supply according to claim 1, characterized in that: The +12V power supply is coupled to pin 1 of the communication interface (CON8), and the first capacitor (CP26) is connected between the +12V power supply and the ground.

7. A communication circuit between an emergency power supply and a conventional power supply according to claim 6, characterized in that: The invention comprises a second diode (DP7), wherein the cathode of the second diode is coupled to the 2nd pin of the communication interface (CON8), and the anode is coupled to the collector of a third transistor (QP11); the emitter of the third transistor (QP11) is connected in series with a fifth resistor (RP59) and then coupled to the cathode of the third diode (DP6), the base is connected in series with a sixth resistor (RP58) and then grounded, and connected to the collector of a fourth transistor (QP10); the base of the fourth transistor (QP10) is connected between the fifth resistor (RP59) and the emitter of the third transistor (QP11), the emitter is coupled to the anode of the third diode (DP6), and is connected to a +12V power supply.

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