Current-controlled battery discharge device

Abstract

The present invention provides a current-controlled battery discharge device, comprising a plurality of power switches connected to one end of a battery; at least one current feedback control circuit applying at least one control signal to the plurality of power switches; at least one current measuring resistor connected to the plurality of power switches and the other end of the battery; and a microprocessor providing at least one reference signal to the at least one current feedback control circuit.

Description

Technical Field

[0001] This invention relates to a current-controlled battery discharge device, and more particularly to an independent current-controlled battery discharge device comprising multiple power switches and multiple current feedback control circuits. Background Technology

[0002] Generally speaking, automobiles that use internal combustion engines that primarily use gasoline or heavy oil have a serious impact on air pollution and other public health hazards.

[0003] Therefore, efforts are currently underway to develop electric or hybrid vehicles in order to reduce pollution.

[0004] In particular, electric vehicles are cars that use battery motors powered by electrical energy output from batteries. Since most of the battery cells that can be charged and discharged use a pack of batteries as the main power source, they have the advantages of having no exhaust fumes and very little noise.

[0005] After the battery is used up, in order to ensure electrical safety, it must be removed from the vehicle beforehand and then immersed in salt water to discharge. In this salt water immersion discharge, the preparation and management of salt water is inconvenient, and additional equipment such as large-capacity water tanks, hoists, and forklifts are required during discharge, resulting in poor operability.

[0006] In addition, harmful gases and wastewater are generated during discharge, the battery is corroded by salt water, and the battery's reuse value decreases after discharge. Since the discharge method uses electrolysis, the remaining electrical energy in the battery cannot be reused.

[0007] Furthermore, since the battery voltage cannot be measured during the discharge process in salt water, the end time of the discharge cannot be known, and there is a problem that a long time is required for reliable discharge. Summary of the Invention

[0008] The technical problem to be solved:

[0009] The present invention aims to solve these problems and provides an independent current-controlled battery discharge device that improves safety and extends battery life by independently controlling multiple power switches by connecting multiple current feedback control circuits to multiple power switches respectively.

[0010] Technical solution:

[0011] To achieve the above objectives, the present invention relates to a plurality of power switches connected to one terminal of a battery;

[0012] At least one current feedback control circuit that acknowledges at least one control signal to the aforementioned majority of power switches;

[0013] At least one current-measuring resistor is connected to the other terminal of the aforementioned power switches and the aforementioned battery;

[0014] A current-controlled battery discharge device is provided, comprising a microprocessor for providing at least one reference signal to the at least one current feedback control circuit.

[0015] In addition, the at least one current feedback control circuit transmits at least one measurement signal corresponding to the discharge current of the plurality of power switches to the microprocessor, and the microprocessor can transmit at least one reference signal corresponding to the at least one measurement signal to the at least one current feedback control circuit.

[0016] In addition, the aforementioned at least one current feedback control circuit can control the discharge current of the aforementioned majority of power switches by using the aforementioned at least one control signal corresponding to the aforementioned at least one reference signal.

[0017] In addition, the aforementioned majority of power switches include first to nth power switches, the aforementioned at least one current feedback control circuit includes first to nth current feedback control circuits respectively connected to the aforementioned first to nth power switches, and the aforementioned at least one current sensing resistor may include first to nth current sensing resistors respectively connected to the aforementioned first to nth power switches.

[0018] In addition, the at least one control signal mentioned above includes first to nth control signals respectively applied to the first to nth power switches, and the at least one reference signal may include first to nth reference signals respectively transmitted to the first to nth current feedback control circuits.

[0019] In addition, the current-controlled battery discharge device may also include a selection switch connected between the microprocessor and the first to nth current feedback control circuits.

[0020] In addition, the first to nth current feedback control circuits transmit the first to nth measurement signals corresponding to the discharge current of the first to nth power switches to the microprocessor. The microprocessor transmits the first to nth reference signals and selection signals corresponding to the first to nth measurement signals to the selection switch. The selection switch can transmit the first to nth reference signals to the first to nth current feedback control circuits respectively according to the selection signal.

[0021] In addition, the aforementioned first to nth current feedback control circuits can use the aforementioned first to nth control signals corresponding to the aforementioned first to nth reference signals to control the aforementioned discharge current of the aforementioned first to nth power switches.

[0022] Technical effects:

[0023] This invention improves stability and extends lifespan by independently controlling multiple power switches by connecting multiple current feedback control circuits to multiple power switches respectively. Attached Figure Description

[0024] Figure 1 This is a diagram of a current-controlled battery discharge device according to the first embodiment of the present invention.

[0025] Figure 2 This is a diagram of a current-controlled battery discharge device according to a second embodiment of the present invention. Detailed Implementation

[0026] The present invention will now be described with reference to the accompanying drawings.

[0027] Figure 1 This is a diagram illustrating a current-controlled battery discharge device according to a first embodiment of the present invention.

[0028] like Figure 1 As shown, the current-controlled battery discharge device (110) according to the first embodiment of the present invention includes a battery (120), a plurality of power switches (130), a current measuring resistor (140), a current feedback control circuit (150) and a microprocessor (160).

[0029] Specifically, after use, the positive and negative terminals of the battery (120) used for discharging can be connected to most power switches (130) and current measuring resistors (140), respectively.

[0030] Most power switches (130) are connected in parallel between the battery (120) and the current-measuring resistor (140).

[0031] Switching control is performed based on the control signal (CS) of the current feedback control circuit (150) to regulate the amount of discharge current flowing from the positive terminal to the negative terminal of the battery (120), thereby converting the residual power of the battery (120) into heat and releasing it.

[0032] For example, most power switches (130) may include first to nth power switches (PSI to PSn) of one of a transistor (TR), a field effect transistor (FET), or an insulated gate bipolar transistor (IGBT).

[0033] Most power switches (130) include a gate electrode, a drain electrode, and a source electrode.

[0034] The gate electrode is connected to the current feedback control circuit (150) to receive the control signal (CS), the drain electrode is connected to the positive terminal of the battery (120), and the source electrode can be connected to one end of the current measuring resistor (140).

[0035] A current-measuring resistor (140) is connected between a plurality of power switches (130) and a battery (120) to measure the amount of discharge current flowing between the positive and negative terminals of the battery (120) through the plurality of power switches (130). One end of the current-measuring resistor (140) is connected to the plurality of power switches (130), and the other end of the current-measuring resistor (140) can be connected to the negative terminal of the battery (120).

[0036] A current feedback control circuit (150) is connected to each working electrode of a plurality of power switches (130) to apply a control signal (CS), connected to a connection node between the plurality of power switches (130) and a current measuring resistor (140) to measure voltage, calculates discharge current from the voltage value of the connection node and the resistance value of the current measuring resistor (140), and transmits a measurement signal (MS) corresponding to the discharge current to a microprocessor (160).

[0037] For example, when the discharge current flowing through the majority power switches (130) is less than the reference current corresponding to the reference signal (RS), the current feedback control circuit (150) controls the majority power switches (130) using the control signal (CS) corresponding to the turn-on of the majority power switches (130). When the discharge current of the majority power switches (130) is greater than the reference current corresponding to the reference signal (RS), the majority power switches (130) can be controlled using the control signal (CS) corresponding to the turn-on of the majority power switches (130).

[0038] The microprocessor (160) receives the measurement signal (MS) from the current feedback control circuit (150), calculates the reference signal (RS) reflecting the measurement signal (MS), and transmits it to the current feedback control circuit (150).

[0039] In the current-controlled battery discharge device (110) according to the first embodiment, the microprocessor (160) uses a measurement signal (MS) corresponding to the discharge current to calculate a reference signal (RS), the current feedback control circuit (150) uses the reference signal (RS) of the microprocessor (160) to calculate a control signal (CS), and a majority of power switches (130) are switched according to the control signal (CS) of the current feedback control circuit (150), the discharge current flows, and as a result, the remaining power of the battery (120) is converted into heat and released.

[0040] On the other hand, most of the power switches (130) may have different characteristics. If these power switches (130) are controlled by a control signal (CS) of a current feedback control circuit (150), the discharge current flowing through the power switches (130) will be different due to the differences in characteristics, resulting in uneven heat generation of the power switches (130).

[0041] In addition, if this uneven heat generation intensifies, most of the power switches (130) may break. When some of the power switches (130) break, most of the power switches (130) will be connected in parallel, making it difficult to identify the broken power switch. When a broken power switch is short-circuited, the discharge control function of the current-controlled battery discharge device (110) may be lost.

[0042] In another embodiment, a majority of power switches can be independently controlled using a majority current feedback control circuit, as illustrated in the accompanying drawings.

[0043] Figure 2 This is a diagram illustrating a current-controlled battery discharge device according to a second embodiment of the present invention.

[0044] like Figure 2 As shown, the current-controlled battery discharge device (210) according to the second embodiment of the present invention includes a battery (220), a plurality of power switches (230), a plurality of current measuring resistors (240), a plurality of current feedback control circuits (250), a microprocessor (160), and a selection switch (270).

[0045] Specifically, the positive and negative terminals of the battery (220) used for post-discharge can be connected to most power switches (230) and most current measuring resistors (240), respectively.

[0046] A majority of power switches (230) are connected between the battery (220) and a majority of current measuring resistors (240), and the switches are controlled according to a majority of control signals (first to nth control signals) (CS1 to CSn) of a majority of current feedback control circuits (250) to regulate the amount of discharge current flowing from the positive terminal to the negative terminal of the battery (220), thereby converting the remaining power of the battery (220) into heat and releasing it.

[0047] For example, most power switches (130) may include first to nth power switches (PSI to PSn) of one of a transistor (TR), a field effect transistor (FET), or an insulated gate bipolar transistor (IGBT).

[0048] Most power switches (130) include a gate electrode, a drain electrode, and a source electrode.

[0049] The gate electrode is connected to the current feedback control circuit (250) to receive the control signal (CS), the drain electrode is connected to the positive terminal of the battery (220), and the source electrode can be connected to one end of the current measuring resistor (240).

[0050] A current-measuring resistor (240) is connected between a plurality of power switches (230) and a battery (120) to measure the amount of discharge current flowing between the positive and negative terminals of the battery (120) through the plurality of power switches (130). One end of the current-measuring resistor (240) is connected to the plurality of power switches (230), and the other end of the current-measuring resistor (240) can be connected to the negative terminal of the battery (220).

[0051] For example, most current-measuring resistors (240) may include first to nth current-measuring resistors (MR1 to MRn) respectively connected to the first to nth power switches (PS1 to PSn).

[0052] A majority current feedback control circuit (250) is connected to each working electrode of a majority power switch (230), and applies majority control signals (CS1 to CSn) reflecting majority reference signals (RS1 to RSn) to a majority connection node between the majority power switch (230) and the majority current sensing resistor (240), respectively, and measures the voltage, calculates the majority discharge current flowing through the majority power switch (230) from the voltage value of the connection node and the resistance value of the majority current sensing resistor (240), and transmits the majority measurement signals (first to nth measurement signals) (MS1 to MSn) corresponding to the majority discharge current to the microprocessor (260).

[0053] For example, when the majority discharge current flowing through the majority power switches (230) is not satisfied with the majority reference current corresponding to the majority reference signals (RS1 to RSn), the majority current feedback control circuit (250) uses the majority control signals (CS1 to CSn) corresponding to the turn-on of the majority power switches (130) to control the majority power switches (130) respectively.

[0054] When the discharge current of the majority of the majority of the power switches (130) is greater than the majority of the reference current corresponding to the majority of the reference signals (RS1 to RSn), the majority of the power switches (130) can be controlled by the majority of the control signals (CS1 to CSn) corresponding to the turn-on of the majority of the power switches (130).

[0055] Therefore, most current feedback control circuits (250) may include first to nth current feedback control circuits (FC1 to FCn) respectively connected to the first to nth power switches (PS1 to PSn).

[0056] The microprocessor (260) receives the majority measurement signals (MS1 to MSn) from the majority current feedback control circuit (250), calculates the majority reference signals (first to nth reference signals) (RS1 to RSn) that respectively reflect the majority measurement signals (MS1 to MSn), and transmits them to the selection switch (270) together with the selection signal (SS).

[0057] The selector switch (270) receives the majority reference signals (RS1 to RSn) and the select signal (SS) from the microprocessor (260), connects to the majority current feedback control circuit (250), and transmits the majority reference signals (RS1 to RSn) to the majority current feedback control circuit (250) respectively according to the select signal (SS).

[0058] In the current-controlled battery discharge device (210) according to the second embodiment, the microprocessor (260) uses the majority measurement signals (MS1 to MSn) corresponding to the majority discharge current to calculate the majority reference signals (RS1 to RSn), the majority current feedback control circuit (250) uses the majority reference signals (RS1 to RSn) of the microprocessor (260) to calculate the majority control signals (CS1 to CSn), the majority power switch (230) performs independent switching control according to the majority control signals (CS1 to CSn) of the majority current feedback control circuit (250), the majority discharge current flows independently, and as a result, the residual power of the battery (220) is converted into heat and released.

[0059] Furthermore, even when the majority of power switches (230) have different characteristics, since the majority of power switches (230) are also independently controlled by the majority of control signals (CS1 to CSn) of the majority of current feedback control circuits (250), the majority of discharge currents flowing in the majority of power switches (230) are actually kept the same, and the uneven heat generation of the majority of power switches (230) can be prevented, thereby maintaining uniform heat generation.

[0060] In addition, damage to most of the power switches (230) due to heat imbalance can be minimized, and when a portion of the power switches (230) are damaged, the damaged power switches (230) can be checked using most of the measurement signals (MS1 to MSn), and the undamaged power switches (230) can be selectively operated by the selector switch (270), thereby maintaining the discharge control function of the current control method battery discharge device (210), resulting in improved stability and extended lifespan.

Claims

1. A current-controlled battery discharge device, characterized in that, include; Most power switches are connected to one terminal of the battery, and At least one current feedback control circuit that acknowledges at least one control signal to the aforementioned majority of power switches, and At least one current-measuring resistor connected to the aforementioned majority of the power switches and the other terminal of the aforementioned battery, and Includes a microprocessor that provides at least one reference signal to the aforementioned at least one current feedback control circuit; wherein, Most of the aforementioned power switches include the first to the nth power switches. The at least one current feedback control circuit mentioned above includes first to nth current feedback control circuits respectively connected to the first to nth power switches. The aforementioned at least one current-measuring resistor includes first to nth current-measuring resistors respectively connected to the aforementioned first to nth power switches.

2. The current-controlled battery discharge device according to claim 1, characterized in that, The aforementioned at least one current feedback control circuit transmits at least one measurement signal corresponding to the discharge current of the aforementioned plurality of power switches to the aforementioned microprocessor. The microprocessor transmits the at least one reference signal corresponding to the at least one measurement signal to the at least one current feedback control circuit.

3. The current-controlled battery discharge device according to claim 2, characterized in that, The aforementioned at least one current feedback control circuit uses the aforementioned at least one control signal corresponding to the aforementioned at least one reference signal to control the discharge current of the aforementioned majority of power switches.

4. The current-controlled battery discharge device according to claim 1, characterized in that, The aforementioned at least one control signal includes first to nth control signals respectively applied to the first to nth power switches. The aforementioned at least one reference signal includes first to nth reference signals respectively transmitted to the aforementioned first to nth current feedback control circuits.

5. The current-controlled battery discharge device according to claim 4, characterized in that, It also includes a selection switch connected between the aforementioned microprocessor and the first to nth current feedback control circuits.

6. The current-controlled battery discharge device according to claim 5, characterized in that, The aforementioned first to nth current feedback control circuits transmit the first to nth measurement signals corresponding to the discharge currents of the aforementioned first to nth power switches to the aforementioned microprocessor. The microprocessor transmits the first to nth reference signals corresponding to the first to nth measurement signals and the selection switch. The selection switch transmits the first to nth reference signals to the first to nth current feedback control circuits respectively according to the selection signal.

7. The current-controlled battery discharge device according to claim 6, characterized in that, The aforementioned first to nth current feedback control circuits use the aforementioned first to nth control signals corresponding to the aforementioned first to nth reference signals to control the aforementioned discharge current of the aforementioned first to nth power switches respectively.

8. The current-controlled battery discharge device according to claim 1, characterized in that, The first to nth current feedback control circuits are respectively connected to the first to nth connection nodes between the first to nth power switches and the first to nth current measuring resistors to measure the voltage of the first to nth connection nodes; The first to n discharge currents flowing through the first to n power switches are calculated from the voltages of the first to n connection nodes and the current measuring resistors of the first to n current switches.

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