CN211239374U

CN211239374U - Relay control circuit and battery system using same

Info

Publication number: CN211239374U
Application number: CN201922154561.8U
Authority: CN
Inventors: 李小龙; 周逊伟
Original assignee: Hangzhou Xieneng Technology Co ltd
Current assignee: Hangzhou Xieneng Technology Co ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-08-11
Anticipated expiration: 2029-12-05

Abstract

The utility model provides a relay control circuit and use its battery system, relay control circuit include first electric capacity, when receiving the PWM signal, convert the PWM signal into high level signal through the first electric capacity, and drive relay and switch on; when the relay control circuit receives the direct current signal, the received direct current signal is isolated through the first capacitor, and a low level signal is output to drive the relay to be switched off. The utility model discloses turn-off relay that can be reliable avoids the battery system overcharge to appear and overflows the risk.

Description

Relay control circuit and battery system using same

Technical Field

The utility model relates to a battery charge-discharge field, in particular to relay control circuit and use its battery system.

Background

With the development of new energy industry, battery systems are widely applied in the fields of automobiles and energy storage, but the safety problem is increasingly prominent. According to the characteristics of the battery, when faults such as overcharge, overcurrent and overtemperature occur, the risk of fire and explosion exists, and personal and property safety is seriously threatened. In order to cope with this risk, the battery system is generally required to have a function of disconnecting the charge/discharge circuit when a danger is recognized. In the prior art, as shown in fig. 1, an IO port of a microcontroller is generally used in conjunction with a driving circuit to turn off a relay or an MOS transistor, and in order to ensure reliable turn-off, 2 or more relays are used in a loop in some schemes.

The traditional scheme generally uses an IO port output turn-off relay of a microcontroller, however, according to IEC60730 standard, there is a combined output fault in the IO port of the microcontroller, that is, a plurality of IO port stuck faults are continuously output as high or low. This indicates that even if a multi-way relay is added to the loop, there is still a risk that the relay will not turn off due to microcontroller IO failure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can reliably turn off relay control circuit of relay and use its battery system for solve the problem that the relay that prior art exists can't reliably turn off.

In order to achieve the above object, the present invention provides a relay control circuit, which includes a first capacitor, and when receiving a PWM signal, the relay control circuit converts the PWM signal into a high level signal through the first capacitor and drives a relay to conduct; when the relay control circuit receives the direct current signal, the received direct current signal is isolated through the first capacitor, and a low level signal is output to drive the relay to be switched off.

Optionally, the relay control circuit further includes a first circuit and a first resistor, a first end of the first capacitor is connected to a first end of the first resistor, a second end of the first resistor is grounded, and the first end of the first capacitor is an input end of the relay control circuit; the first end of the first circuit is connected with the second end of the first capacitor, the second end of the first circuit is grounded, and the output signal of the first circuit controls the on-off of the relay.

Optionally, the first circuit includes a first diode, a second resistor, and a second capacitor, the anode of the first diode is connected to the cathode of the second diode, and the common connection end of the first diode is connected to the second end of the first resistor; the cathode of the first diode is connected with the first end of the second resistor, and the anode of the second diode is connected with the second end of the second resistor and grounded; the second capacitor is connected with the second resistor in parallel, and the voltage on the second capacitor is an output signal of the relay control circuit.

The utility model also provides a battery system, including group battery, charge-discharge module, relay, the group battery pass through the relay with charge-discharge module connects, battery system still include above an arbitrary relay control circuit, relay control circuit control the relay break-make.

Compared with the prior art, the utility model has the advantages of it is following: when the relay control circuit receives the PWM signal, the PWM signal is converted into a high level signal through the first capacitor, and the relay is driven to be switched off; when the relay control circuit receives the direct current signal, the received direct current signal is isolated through the first capacitor, and a low level signal is output to drive the relay to be conducted.

Drawings

FIG. 1 is a schematic diagram of a prior art battery control system;

FIG. 2 is a schematic diagram of a battery control system according to the present invention;

FIG. 3 is a schematic diagram of a relay control circuit of the present invention;

fig. 4 is a schematic diagram of the battery system of the present invention;

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.

The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, and are only used for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.

Fig. 2 illustrates the schematic diagram of the battery control system of the present invention, and the microcontroller adopts two driving modes of PWM pulse mode and IO port level to drive the corresponding relay respectively. The relay control circuit U00 converts the PWM signal into a high-level signal through a blocking capacitor to drive the relay 1 to be switched on; when the input signal of the relay control circuit U00 is a continuous high level or low level signal, the output is a low level signal, and drives the relay 1 to turn off. Therefore, when the output combination of the microcontroller fails, namely the output signal of each IO interface of the microcontroller is continuously pulled up or continuously pulled down, the relay 1 can be normally disconnected, so that the safety of the battery system is ensured.

Fig. 3 illustrates a schematic diagram of a relay control circuit of the present invention, which includes a first capacitor C1, a first circuit and a first resistor R1, wherein a first end of the first capacitor C1 is connected to a first end of the first resistor R1, a second end of the first resistor R1 is grounded, and a first end of the first capacitor C1 is an input end of the relay control circuit; the first end of the first circuit is connected with the second end of the first capacitor C1, the second end of the first circuit is grounded, and the output signal of the first circuit controls the on-off of the relay. The first circuit comprises a first diode D1, a second diode D2, a second resistor R2 and a second capacitor C2, wherein the anode of the first diode D1 is connected with the cathode of the second diode D2, and the common connection end of the first diode D1 is connected with the second end of the first resistor R1; the cathode of the first diode D1 is connected with the first end of the second resistor R2, and the anode of the second diode D2 is connected with the second end of the second resistor R2 and grounded; the second capacitor C2 is connected in parallel with the second resistor R2, and the voltage on the second capacitor C2 is the output signal of the relay control circuit.

Fig. 4 illustrates a schematic diagram of a battery system of the present invention, and as shown in the figure, the battery system generally includes two relays, i.e., a main positive relay and a main negative relay. When the battery system works abnormally, dangers such as overcharge and overcurrent of the battery system are avoided by controlling the relay to be switched off. The driving method of the main positive relay and the main negative relay is shown in fig. 2, and the relay 1 and the relay 2 in fig. 2 may respectively represent a main positive relay and a main negative relay. If the battery system needs more relays, the microcontroller can utilize a plurality of IO interfaces thereof and drive a plurality of corresponding relays through the relay driving circuit.

Although the embodiments have been described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments not explicitly described, or to another embodiment described.

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

1. A relay control circuit, characterized by: the relay control circuit receives a PWM signal, converts the PWM signal into a high-level signal through the first capacitor and drives the relay to be conducted; when the relay control circuit receives the direct current signal, the received direct current signal is isolated through the first capacitor, and a low level signal is output to drive the relay to be switched off.

2. The relay control circuit of claim 1, wherein: the relay control circuit further comprises a first circuit and a first resistor, wherein the first end of the first capacitor is connected with the first end of the first resistor, the second end of the first resistor is grounded, and the first end of the first capacitor is the input end of the relay control circuit; the first end of the first circuit is connected with the second end of the first capacitor, the second end of the first circuit is grounded, and the output signal of the first circuit controls the on-off of the relay.

3. The relay control circuit of claim 2, wherein: the first circuit comprises a first diode, a second resistor and a second capacitor, wherein the anode of the first diode is connected with the cathode of the second diode, and the common connecting end of the first diode is connected with the second end of the first resistor; the cathode of the first diode is connected with the first end of the second resistor, and the anode of the second diode is connected with the second end of the second resistor and grounded; the second capacitor is connected with the second resistor in parallel, and the voltage on the second capacitor is an output signal of the relay control circuit.

4. The utility model provides a battery system, includes group battery, charge-discharge module, relay, the group battery pass through the relay with the charge-discharge module is connected its characterized in that: the battery system further comprises a relay control circuit according to any one of claims 1 to 3, wherein the relay control circuit controls the on/off of the relay.