Energy storage type thermal battery activation circuit

Abstract

The utility model provides an energy storage type thermal battery activation circuit which comprises a power supply module, a super capacitor C2 and a switch module which are connected in sequence, and the switch module and the super capacitor C2 are respectively connected with a control module. The power supply module is used for charging the super capacitor C2, the control module is used for controlling the switch module to be closed after the voltage at the two ends of the super capacitor C2 reaches a set threshold value, and activation current output by the super capacitor C2 is output to the igniter through the switch module to activate the thermal battery. According to the utility model, the super capacitor C2 is charged and stored in advance through the power supply module, and then the super capacitor C2 is instantly discharged to provide energy required by activation of the thermal battery, so that activation of the thermal battery is realized, the power of the power supply module can be greatly reduced, and the volume and the mass of the thermal battery activation device can be reduced; and the device is suitable for carriers with requirements on installation space or overall quality.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal batteries, in particular to an energy storage type thermal battery activation circuit. Background Art

[0002] Thermal batteries are disposable chemical batteries widely used in modern weapon systems, which output rated voltage and current to enable the weapon system to work properly. For safety reasons, the igniters used in thermal batteries are basically insensitive igniters, which require a relatively large activation current to be activated successfully. A relatively large activation current requires a power supply with sufficient power. A power supply module with a large power is not only large in volume but also heavy in mass, which is not feasible for carriers with requirements for installation space or overall mass. Content of the Utility Model

[0003] The utility model provides an energy storage type thermal battery activation circuit, which solves the problems in the prior art that the high-power power supply module required for igniter activation is not feasible for carriers with requirements for installation space or overall mass due to its large volume and heavy mass.

[0004] The technical solution of the utility model is realized as follows:

[0005] The utility model provides an energy storage type thermal battery activation circuit, which includes a power supply module, a super capacitor C2 and a switch module connected in sequence. The switch module and the super capacitor C2 are respectively connected to a control module. The power supply module is used to charge the super capacitor C2. The control module is used to control the switch module to close after the voltage at both ends of the super capacitor C2 reaches a set threshold value. The activation current output by the super capacitor C2 is output to the igniter through the switch module to activate the thermal battery.

[0006] The utility model pre-charges and stores energy in the super capacitor C2 through the power supply module, and then uses the super capacitor C2 to instantaneously discharge to provide the energy required for thermal battery activation, so as to realize the activation of the thermal battery, which can greatly reduce the power of the power supply module, thereby reducing the volume and mass of the thermal battery activation device, and is applicable to carriers with requirements for installation space or overall mass.

[0007] Specifically, a charging voltage management module is connected between the power supply module and the super capacitor C2, which is used to stop charging after the voltage at both ends of the super capacitor C2 reaches a set threshold value, so as to avoid overcharging and damaging the super capacitor C2.

[0008] Further, the charging voltage management module includes: a voltage-dividing resistor R1, a voltage-dividing resistor R2, a gate capacitor C1, a voltage-regulating diode D1, a current-limiting resistor R3, and an electronic switching tube Q1. The voltage-dividing resistor R1 and the voltage-dividing resistor R2 are connected in series across the two ends of the power supply module. The gate capacitor C1 and the voltage-regulating diode D1 are respectively connected in parallel across the two ends of the voltage-dividing resistor R1 and the voltage-dividing resistor R2. The current-limiting resistor R3 and the electronic switching tube Q1 are connected in series and then connected in parallel across the two ends of the gate capacitor C1. The drain of the electronic switching tube Q1 is connected to the current-limiting resistor R3. The gate of the electronic switching tube Q1 is connected to the gate capacitor C1. The source of the electronic switching tube Q1 is connected to the supercapacitor C2. The voltage-regulating diode D1 is used to clamp the gate voltage of the electronic switching tube Q1, and the on-off of the electronic switching tube Q1 is controlled by controlling the voltage difference between the gate and the source of the electronic switching tube Q1, so as to control the electronic switching tube Q1 to disconnect when the voltage of the supercapacitor C2 is charged to a set threshold, stop charging continuously, and play a protective role for the supercapacitor C2.

[0009] Specifically, the switching module includes an electronic switching tube Q2, a delay circuit, and an isolation conversion circuit. The supercapacitor C2 and the isolation conversion circuit are respectively connected to the delay circuit. The delay circuit, the electronic switching tube Q2, and the igniter are connected in sequence. The output end of the control module is connected to the input end of the isolation conversion circuit. The isolation conversion circuit is used to isolate the small-current activation signal output by the control module from the large-current activation signal output by the supercapacitor C2 to prevent signal interference. The delay circuit is used to delay the opening time of the electronic switching tube Q2.

[0010] Further, the delay circuit includes a voltage-dividing resistor R5, a voltage-dividing resistor R6, and a gate capacitor C4. The voltage-dividing resistor R5 and the voltage-dividing resistor R6 are connected in series. The gate capacitor C4 is connected in parallel across the two ends of the voltage-dividing resistor R5. The source of the electronic switching tube Q2 is connected to the node between the supercapacitor C2 and the voltage-dividing resistor R5. The gate of the electronic switching tube Q2 is connected to the node between the voltage-dividing resistor R5 and the voltage-dividing resistor R6. The drain of the electronic switching tube Q2 is connected to the positive electrode of the igniter. The voltage-dividing resistor R6 and the negative electrode of the igniter are connected through the isolation conversion circuit. The delay circuit provides the opening voltage of the electronic switching tube Q2 through the voltage division of the voltage-dividing resistor R5 and the voltage-dividing resistor R6, and forms a discharge delay through the gate capacitor C4 and the voltage-dividing resistor R6, so that the electronic switching tube Q2 is slowly turned on, thereby reducing the influence caused by the input current fluctuation, preventing the electronic components in the loop from being damaged due to excessive current at the start-up moment, reducing the power supply current noise, and improving the stability of the circuit.

[0011] Further, the isolation conversion circuit includes a current-limiting resistor R4, a filter capacitor C3, and an optocoupler isolator U1. The current-limiting resistor R4 is connected in series with the input terminal of the optocoupler isolator U1, the filter capacitor C3 is connected in parallel with the input terminal of the optocoupler isolator U1, and the output terminal of the optocoupler isolator U1 is connected to the voltage-dividing resistor R6 and the negative electrode of the igniter. The optocoupler isolator U1 optically isolates the small-current activation signal output by the control module and the large-current activation signal provided by the supercapacitor C2, which can avoid signal interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0013] Figure 1 It is a circuit schematic diagram of an energy storage type thermal battery activation circuit of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0015] Referring to Figure 1 , an embodiment of the present invention provides an energy storage type thermal battery activation circuit, including a power supply module, a supercapacitor C2, and a switch module connected in sequence. The switch module and the supercapacitor C2 are respectively connected to a control module (MCU); the power supply module is used to charge the supercapacitor C2, and the MCU is used to control the switch module to close after the voltage across the supercapacitor C2 reaches a set threshold. The activation current output by the supercapacitor C2 is output to the igniter through the switch module to activate the thermal battery.

[0016] The present invention charges and stores energy in the supercapacitor C2 in advance through the power supply module, and then uses the supercapacitor C2 to instantaneously discharge to provide the energy required for activating the thermal battery, thereby realizing the activation of the thermal battery. It can greatly reduce the power of the power supply module, and thus can reduce the volume and mass of the thermal battery activation device, and is suitable for carriers with requirements for installation space or overall mass.

[0017] In this embodiment, the MCU is connected to the supercapacitor C2 mainly to monitor the voltage value across the supercapacitor C2. Then, the MCU is used to determine whether the voltage across the supercapacitor C2 reaches the set value requirement. After meeting the conditions, the MCU issues an output command to the switch module, so as to output the large current released by the supercapacitor C2 to the igniter to activate the thermal battery.

[0018] Specifically, a charging voltage management module is connected between the power supply module and the supercapacitor C2, which is used to stop charging after the voltage across the supercapacitor C2 reaches the set threshold, so as to avoid overcharging and damage of the supercapacitor C2.

[0019] Further, the charging voltage management module includes: a voltage dividing resistor R1, a voltage dividing resistor R2, a gate capacitor C1, a voltage stabilizing diode D1, a current limiting resistor R3 and a power electronic switch Q1. The voltage dividing resistor R1 and the voltage dividing resistor R2 are connected in series across the power supply module. The gate capacitor C1 and the voltage stabilizing diode D1 are respectively connected in parallel across the voltage dividing resistor R1 and the voltage dividing resistor R2. The current limiting resistor R3 and the power electronic switch Q1 are connected in series and then connected in parallel across the gate capacitor C1. The drain D of the power electronic switch Q1 is connected to the current limiting resistor R3. The gate G of the power electronic switch Q1 is connected to the gate capacitor C1. The source S of the power electronic switch Q1 is connected to the supercapacitor C2. The voltage stabilizing diode D1 is used to clamp the gate voltage of the power electronic switch Q1, and control the on-off of the power electronic switch Q1 by controlling the voltage difference between the gate G and the source S of the power electronic switch Q1, so as to control the power electronic switch Q1 to disconnect when the voltage of the supercapacitor C2 is charged to the set threshold, stop charging continuously, and play a protective role for the supercapacitor C2.

[0020] Specifically, the switch module includes a power electronic switch Q2, a delay circuit and an isolation conversion circuit. The supercapacitor C2 and the isolation conversion circuit are respectively connected to the delay circuit. The delay circuit, the power electronic switch Q2 and the igniter are connected in sequence. The output end of the MCU is connected to the input end of the isolation conversion circuit. The isolation conversion circuit is used to isolate the small current activation signal output by the MCU from the large current activation signal output by the supercapacitor C2 to prevent signal interference. The delay circuit is used to delay the opening time of the power electronic switch Q2.

[0021] Further, the delay circuit includes a voltage-dividing resistor R5, a voltage-dividing resistor R6, and a gate capacitor C4. The voltage-dividing resistor R5 and the voltage-dividing resistor R6 are connected in series, and the gate capacitor C4 is connected in parallel across the two ends of the voltage-dividing resistor R5. The source S of the electronic switch tube Q2 is connected to the node between the supercapacitor C2 and the voltage-dividing resistor R5. The gate G of the electronic switch tube Q2 is connected to the node between the voltage-dividing resistor R5 and the voltage-dividing resistor R6. The drain D of the electronic switch tube Q2 is connected to the positive electrode of the igniter. The voltage-dividing resistor R6 and the negative electrode of the igniter are connected through an isolation conversion circuit. The delay circuit provides the turn-on voltage of the electronic switch tube Q2 through the voltage division of the voltage-dividing resistor R5 and the voltage-dividing resistor R6, and forms a discharge delay through the gate capacitor C4 and the voltage-dividing resistor R6, so that the electronic switch tube Q2 is slowly turned on, thereby reducing the influence caused by the input current fluctuation, preventing the electronic components in the loop from being damaged due to excessive current at the start-up moment, reducing the power supply current noise, and improving the stability of the circuit.

[0022] Further, the isolation conversion circuit includes a current-limiting resistor R4, a filter capacitor C3, and an opto-isolator U1. The current-limiting resistor R4 is connected in series with the input end of the opto-isolator U1, and the filter capacitor C3 is connected in parallel with the input end of the opto-isolator U1. The output end of the opto-isolator U1 is connected to the voltage-dividing resistor R6 and the negative electrode of the igniter. The opto-isolator U1 is used to optically isolate the small-current activation signal output by the MCU and the large-current activation signal provided by the supercapacitor C2, which can avoid signal interference.

[0023] In the specific implementation process, since the required activation current is relatively large, when selecting the supercapacitor C2, it is necessary to consider its own voltage drop and maximum discharge current during the discharge instant. Considering the above factors, and then according to the magnitude and duration of the activation current, select a supercapacitor C2 with a suitable capacitance value; the selection of the current-limiting resistor R3 determines the magnitude of the charging current. It is necessary to consider the rated input current of the supercapacitor C2, the charging completion time, and the occupied space size, and reasonably select the resistance value and power of the current-limiting resistor R3; by selecting the key parameters of the zener diode D1 and the electronic switch tube Q1, the voltage value after the supercapacitor C2 is charged can be controlled; by controlling the voltage difference between the gate and the source of the electronic switch tube Q1 through the zener diode D1 and the supercapacitor C2, the charging control of the supercapacitor C2 can be automatically completed without an additional control signal.

[0024] The working principle of the activation circuit of the present utility model is as follows:

[0025] In the initial state, the external DC28V power supply module is not connected, the electronic switch tube Q1 is in the off state, no current flows through the current-limiting resistor R3, and the supercapacitor C2 has not started to charge;

[0026] When the external DC 28V power supply module starts to supply power, after voltage division by resistors R1 and R2, a stable voltage of about 9.5V is generated across the zener diode D1. Due to the presence of the gate capacitor C1, the voltage at the gate G of the electronic switch Q1 gradually increases, causing the electronic switch Q1 to conduct. Subsequently, the charging current passes through the charging current-limiting resistor R3 and the electronic switch Q1 to start charging the supercapacitor C2;

[0027] After a period of charging, the voltage across the supercapacitor C2 gradually rises, that is, the voltage value at the source S of the electronic switch Q1 gradually increases. At this time, since the zener diode D1 always clamps the gate voltage of the electronic switch Q1 at 9.5V, when the supercapacitor C2 is charged close to 9V, the voltage difference between the gate G and the source S of the electronic switch Q1 is about 0.5V, which is less than its conduction threshold condition, and the electronic switch Q1 turns off, ending the charging of the supercapacitor C2;

[0028] When the MCU recognizes that the supercapacitor C2 has been fully charged (it can be determined whether the charging is complete by monitoring the voltage across the supercapacitor C2 or the charging current between the electronic switch Q1 and the supercapacitor C2), the MCU outputs an activation signal DCJH_KO, and isolates the small current signal output by the activation from the large current signal output by the supercapacitor C2 through an isolation conversion circuit;

[0029] After the MCU outputs the activation signal DCJH_KO, the activation signal flows into the input terminal of the optocoupler isolator U1 after being current-limited by the resistor R4 and forms a closed loop. Therefore, the output terminal of the optocoupler isolator U1 conducts. The voltage divider resistor R5 and the voltage divider resistor R6 divide the voltage output by the supercapacitor C2. After the output terminal of the optocoupler isolator U1 conducts, the initial voltage of the gate capacitor C4 is the same as that of the parallel voltage divider resistor R5. Subsequently, the gate capacitor C4 discharges through the voltage divider resistor R6. As the charge at both ends of the gate capacitor C4 gradually decreases, the gate voltage of the electronic switch Q2 gradually decreases, a voltage difference is formed between the gate G and the source S and the voltage difference gradually increases, and the electronic switch Q2 conducts accordingly. The supercapacitor C2 outputs current to the thermal battery igniter through the electronic switch Q2, thus realizing the activation of the thermal battery.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An activation circuit for a storage thermal battery, characterized in that It includes a power module, a supercapacitor C2, and a switching module connected in sequence. The switching module and the supercapacitor C2 are respectively connected to a control module. The power module is used to charge the supercapacitor C2. The control module is used to control the closing of the switching module after the voltage across the supercapacitor C2 reaches a set threshold. The activation current output by the supercapacitor C2 is output to the igniter through the switching module to activate the thermal battery.

2. The activation circuit of a storage thermal battery according to claim 1, characterized in that A charging voltage management module is connected between the power module and the supercapacitor C2, and is used to stop charging after the voltage across the supercapacitor C2 reaches a set threshold.

3. The activation circuit of a storage thermal battery according to claim 2, characterized in that The charging voltage management module includes: a voltage-dividing resistor R1, a voltage-dividing resistor R2, a gate capacitor C1, a voltage-stabilizing diode D1, a current-limiting resistor R3, and a power electronic switch Q1. The voltage-dividing resistor R1 and the voltage-dividing resistor R2 are connected in series across the two ends of the power module. The gate capacitor C1 and the voltage-stabilizing diode D1 are respectively connected in parallel across the voltage-dividing resistor R1 and the voltage-dividing resistor R2. The current-limiting resistor R3 and the power electronic switch Q1 are connected in series and then connected in parallel across the two ends of the gate capacitor C1. The drain of the power electronic switch Q1 is connected to the current-limiting resistor R3. The gate of the power electronic switch Q1 is connected to the gate capacitor C1. The source of the power electronic switch Q1 is connected to the supercapacitor C2.

4. The activation circuit of a storage thermal battery according to claim 1, wherein The switching module includes a power electronic switch Q2, a delay circuit, and an isolation conversion circuit. The supercapacitor C2 and the isolation conversion circuit are respectively connected to the delay circuit. The delay circuit, the power electronic switch Q2, and the igniter are connected in sequence. The output end of the control module is connected to the input end of the isolation conversion circuit. The isolation conversion circuit is used to isolate the small-current activation signal output by the control module from the large-current activation signal output by the supercapacitor C2. The delay circuit is used to delay the opening time of the power electronic switch Q2.

5. The activation circuit of a storage thermal battery according to claim 4, wherein, The delay circuit includes a voltage-dividing resistor R5, a voltage-dividing resistor R6, and a gate capacitor C4. The voltage-dividing resistor R5 and the voltage-dividing resistor R6 are connected in series. The gate capacitor C4 is connected in parallel across the voltage-dividing resistor R5. The source of the power electronic switch Q2 is connected to the node between the supercapacitor C2 and the voltage-dividing resistor R5. The gate of the power electronic switch Q2 is connected to the node between the voltage-dividing resistor R5 and the voltage-dividing resistor R6. The drain of the power electronic switch Q2 is connected to the positive pole of the igniter. The voltage-dividing resistor R6 and the negative pole of the igniter are connected through the isolation conversion circuit.

6. The activation circuit of a storage thermal battery as described in claim 5, characterized in that The isolation conversion circuit includes a current-limiting resistor R4, a filter capacitor C3, and an opto-isolator U1. The current-limiting resistor R4 is connected in series with the input end of the opto-isolator U1. The filter capacitor C3 is connected in parallel with the input end of the opto-isolator U1. The output end of the opto-isolator U1 is connected to the voltage-dividing resistor R6 and the negative pole of the igniter.

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