TWI641194B - Power device with wiring safety function - Google Patents

Abstract

A power supply unit with wiring protection. The power supply device has a switching module, a sensing resistor, a first power transistor and a diode. The switching module is electrically connected to the power input end and the ground end. The switching module is configured to transmit electrical energy from the power input to a power output. One end of the sensing resistor is electrically connected to the switching module. The other end of the sensing resistor is electrically connected to a first node. There is a body diode between the two ends of the first power transistor. One end of the diode is electrically connected to one end of the same polarity of the body diode. The diode is electrically connected to the first power transistor between the first node and the power output end.

Description

Power supply unit with wiring protection

The present invention relates to a power conversion circuit, and more particularly to a power conversion circuit for providing a DC power supply.

Electronic products continue to evolve, and the power supply specifications of electronic products are constantly changing. Therefore, in general, when testing electronic products or batteries, power conversion circuits are used to change the way power is supplied for electronic products or battery specifications. By controlling the power conversion circuit, manufacturers can use a similar machine to test a variety of electronic devices or batteries.

Although the power conversion circuit provides considerable test flexibility for the manufacturer, in practice, the human error of the production line may still cause irreparable consequences. For example, when the charging battery is charged by the power conversion circuit for DC test, the positive output terminal of the power conversion circuit should be electrically connected to the positive electrode of the rechargeable battery, and the negative output terminal of the power conversion circuit should be powered. It is connected to the negative electrode of the rechargeable battery. However, when the line personnel electrically connect the negative output terminal of the power conversion circuit to the positive electrode of the rechargeable battery, and the positive output terminal of the power conversion circuit is electrically connected to the negative electrode of the rechargeable battery, the circuit At the moment of connection, the battery is likely to discharge the power conversion circuit, which may cause damage to the power components of the power conversion circuit, and may even cause safety problems.

In the past, it was possible to avoid damage to the power conversion circuit by adding a fuse. However, due to the specification requirements, the addition of a fuse may be costly, thereby increasing the cost of testing. On the other hand, replacing the fuse may also cause delays in the production line schedule. In another approach, it may be possible to determine the polarity of the battery of the rechargeable battery by adding another set of detection lines, and at the same time draw electrical data. However, in practice, the line personnel may still confuse the polarity of the battery of the rechargeable battery and the polarity of the power output of the power conversion circuit.

The present invention provides a power supply device with wiring protection to prevent the power conversion circuit from being damaged due to human error of the line personnel, and the power supply device with wiring protection can be restored to normal by a simple operation.

The invention discloses a power supply device with wiring protection. The power supply device has a switching module, a sensing resistor, a first power transistor and a diode. The switching module is electrically connected to the power input end and the ground end. The switching module is configured to transmit electrical energy from the power input to a power output. One end of the sensing resistor is electrically connected to the switching module. The other end of the sensing resistor is electrically connected to a first node. There is a body diode between the two ends of the first power transistor. One end of the diode is electrically connected to one end of the same polarity of the body diode. The diode is electrically connected to the first power transistor between the first node and the power output end. In an initial configuration phase, the switching module is turned off, and the first power transistor is operated in the ohmic region, and the power device determines whether the electronic device is correctly electrically connected to the power output end and the ground terminal according to the voltage of the sensing resistor.

Another power supply device with wiring protection is disclosed. The power supply device has a switching device, a sensing resistor, a first relay, and a shunt resistor. The switching module is electrically connected to a power input end and a ground end. The switching module is configured to transfer electrical energy from the power input to a power output. One end of the sensing resistor is electrically connected to the switching module. The other end of the sensing resistor is electrically connected to a first node. One end of the first relay is electrically connected to the first node. The other end of the first relay is electrically connected to the power output. The shunt resistor is connected in parallel to the first relay. Wherein, in an initial configuration phase, the switching module is turned off, the first relay is disconnected, and the power supply device determines whether an electronic device is correctly electrically connected to the power output end and the ground end according to the voltage of the sensing resistor.

In summary, the present invention provides a power conversion circuit in which one of the power crystal system of the power conversion circuit operates in an ohmic region. Therefore, when an abnormal situation occurs, for example, the line personnel reverse the output end of the power conversion circuit and the electrode of the power take-off device, because the internal circuit of the power conversion circuit has a high impedance, thereby reducing the power supply device to provide power conversion. The discharge current of the circuit. Thereby, the power conversion circuit can be prevented from being damaged due to human error of the line personnel. Moreover, in the production line process, the initial configuration stage of the power conversion circuit allows the production line personnel to properly configure the test environment, and also provides a margin for the production line personnel.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

Please refer to FIG. 1. FIG. 1 is a functional block diagram of a power supply device with wiring protection according to an embodiment of the invention. Figure 1 discloses a power supply unit 1 with wiring protection. The power supply device 1 with wiring protection includes a switching module 12, a sensing resistor 14, a first power transistor 16 and a diode 18. The switching module 12 is electrically connected to the power input terminal EP and the ground GND. The switching module 12 is configured to transmit electrical energy from the power input terminal EP to the power output terminal DV. One end of the sensing resistor 14 is electrically connected to the switching module 12 . The other end of the sensing resistor 14 is electrically connected to the first node N1. A body diode 162 is disposed between the two ends of the first power transistor 16. One end of the diode 18 is electrically connected to one end of the same polarity of the body diode 162. The diode 18 is electrically connected to the first power transistor 16 between the first node N1 and the power output terminal DV. Wherein, in an initial configuration phase, the switching module 12 is turned off, and the first power transistor 16 operates in the ohmic region. The switching module 12 is closed and the switching module 12 does not temporarily transfer power from the power input terminal EP to the power output terminal DV for a period of time. The power supply device 1 determines whether an electronic device is correctly electrically connected to the power output terminal DV and the ground terminal GND according to the voltage of the sensing resistor 14. The electronic device is, for example, a rechargeable battery or other electronic product having a storage capacity, and the following is exemplified by a rechargeable battery.

2A is a more detailed description of a power supply device with wiring protection. FIG. 2A is a circuit diagram of a power supply device with wiring protection according to an embodiment of the invention. As shown in FIG. 2A, the power supply device 1 with wiring protection has a first transistor M1, a second transistor M2, an inductor L, a sense resistor R1, a third transistor M3, and a fourth transistor M4. In this embodiment, the circuit structure composed of the first transistor M1 and the second transistor M2 is included in the foregoing switching module 12, and the sensing resistor R1 corresponds to the aforementioned sensing resistor 14, the third transistor. The M3 system corresponds to the aforementioned first power transistor 16, and the body diode system of the fourth transistor M4 corresponds to the aforementioned diode 18.

The first transistor M1 has a first end, a second end, and a first control end. The first end of the first transistor M1 is electrically connected to the power input terminal EP of the input power source P. First transistor M1 The second end is electrically connected to the second node N2. The first control end of the first transistor M1 is configured to receive the first control signal SC1. The first transistor M1 is controlled by the first control signal SC1 to selectively turn on the first end and the second end of the first transistor M1. The first transistor M1 and the subsequent transistor are, for example, P-type enhancement type metal oxide semi-conductor transistors (MOSFETs), but are not limited thereto.

The second transistor M2 has a third end, a fourth end, and a second control end. The third end of the second transistor M2 is electrically connected to the second node N2. The fourth end of the second transistor M2 is electrically connected to the ground GND of the power source and the power output terminal DV. The second control end of the second transistor M2 is configured to receive the second control signal SC2. The second transistor M2 is controlled by the second control signal SC2 to selectively turn on the third end and the fourth end of the second transistor M2.

One end of the inductor L is electrically connected to the second node N2. One end of the sensing resistor R1 is electrically connected to the other end of the inductor L. The other end of the sensing resistor R1 is electrically connected to the first node N1. One end of the capacitor C2 is electrically connected to the first node N1. The other end of the capacitor C2 is electrically connected to the ground GND. Here, the inductance L, the type of the resistor R1 and the capacitor C2, the inductance value of the inductor L, the resistance value of the resistor R1, and the capacitance value of the capacitor C2 are not limited.

The third transistor M3 has a fifth end, a sixth end, and a third control end. The fifth end of the third transistor M3 is electrically connected to the first node N1. The sixth end of the third transistor M3 is electrically connected to the ground GND directly or indirectly. The third control end of the third transistor M3 is configured to receive the third control signal SC3. The third transistor M3 is controlled by the third control signal SC3 to selectively turn on the fifth end and the sixth end of the third transistor M3. The third transistor M3 has an equivalent body diode D3. Equivalent body diode D3, such as an equivalent diode between the substrate and the source of the metal oxide semiconductor transistor, is not intended to refer to a real diode element. The relevant details of the body diode should be well known to those of ordinary skill in the art and are not limited herein. The anode end of the equivalent body diode D3 is electrically connected to the sixth end of the third transistor M3. The cathode end of the equivalent body diode D3 is connected to the fifth end of the third transistor M3.

Wherein, the power output terminal DV and the ground terminal GND are respectively electrically connected The first connection end and the second connection end of the electric device. In this embodiment and the following, the charging device is taken as an example of the rechargeable battery B, but it is not limited thereto in practice. The rechargeable battery B has a first electrode E1 and a second electrode E2. Ideally, when the power supply device 1 with the wiring protection is electrically connected to the rechargeable battery B, the first electrode E1 should be electrically connected to the power output terminal DV, and the second electrode E2 should be electrically connected to the ground terminal GND. However, in practice, the first electrode E1 may be electrically connected to the ground GND, and the second electrode E2 may be electrically connected to the power output terminal DV, thereby causing an abnormal condition.

Please refer to FIG. 2B for illustration. FIG. 2B is a schematic diagram of a current path when the power supply device with wiring protection shown in FIG. 2A is electrically connected to the rechargeable battery according to the present invention. As shown in FIG. 2B, the first electrode E1 is electrically connected to the ground GND, and the second electrode E2 is electrically connected to the power output terminal DV. At this time, the rechargeable battery B supplies the current I to the power supply device 1 having the wiring protection. Since the internal impedance of the power supply device 1 having the wiring protection may not be so large, the current of the current I is excessively large, so that the components in the power supply device 1 having the wiring protection are burned by the current supplied from the rechargeable battery B. For example, the equivalent body diode D3 of the third transistor M3 is likely to withstand excessive reverse bias and collapse and burn.

In view of this, when the power supply device 1 with wiring protection is electrically connected to the rechargeable battery B, in the initial configuration phase, the first transistor M1 and the second transistor M2 are not turned on, and the third transistor M3 is operated in the ohmic region ( Ohmic mode). The ohmic region is called a triode mode or a linear region. In practice, during the initial configuration phase, the control terminal of the third transistor M3 can be applied with a relatively small voltage to operate the third transistor M3 in the ohmic region; or the control terminal of the third transistor M3. A pulse width modulation signal (PWM signal) can be applied, and the duty ratio of the pulse width modulation signal is adjusted to make the third power during the initial configuration phase. Crystal M3 operates in the ohmic region.

The initial configuration stage refers to, for example, a predetermined time interval when the rechargeable battery B is electrically connected to the power supply device 1 with wiring protection, and the initial configuration is not limited herein. The length of time for the stage. At this time, the current I supplied from the rechargeable battery B is transmitted along the current path shown in FIG. 2B. More specifically, the current I flows through the equivalent body diode D2 of the second transistor M2, the inductance L, the sense resistor R1, the third transistor M3, and the rechargeable battery B. Since the third transistor M3 operates in the ohmic region at this time, the third transistor M3 has a relatively large impedance in the initial configuration stage, and the impedance of the power supply device 1 having the wiring protection is improved. Therefore, even if the first electrode E1 is electrically connected to the power output terminal DV, the second electrode E2 is electrically connected to the ground GND, thereby causing the rechargeable battery B to discharge the power supply device 1 with the wiring protection, and the current of the current supplied by the rechargeable battery B. The size is also within an acceptable range due to the impedance of the third transistor M3 during the initial configuration phase.

The fourth transistor M4 has a seventh end, an eighth end, and a fourth control end. The seventh end of the fourth transistor M4 is electrically connected to the fifth end, the eighth end of the fourth transistor M4 is electrically connected to the power output terminal DV, and the fourth control end of the fourth transistor M4 is configured to receive the fourth control signal. SC4. In the initial configuration phase, the fourth transistor M4 is not turned on. Further, the second transistor M2 has an equivalent body diode D2. The fourth transistor M4 has an equivalent body diode D4. The anode end of the equivalent body diode D2 is electrically connected to the fourth end. The cathode end of the equivalent body diode D2 is electrically connected to the third end. The anode end of the equivalent body diode D3 is electrically connected to the seventh end, and the cathode end of the equivalent body diode D4 is electrically connected to the eighth end. Thereby, when the rechargeable battery B supplies the current I to the power supply device 1 with wiring protection, the equivalent body diode D2 and the equivalent body diode D4 can provide a bypass current path to transmit the current I, which is more effective The surge current is reduced to further prevent the rechargeable battery B from damaging the power supply device 1 having the wiring protection.

On the other hand, in an embodiment, the power supply device 1 with wiring protection further has a detection module 11. The detecting module 11 is connected in parallel to the sensing resistor R1. In the initial configuration stage, when the detecting module 11 determines that the voltage across the sensing resistor R1 is greater than the threshold, the detecting module 11 is configured to provide a warning signal. The warning signal is used to indicate that the connection manner between the first output end and the second output end and the power taking device is incorrect. In an embodiment, the power supply device 1 with wiring protection can be configured, for example, with a light emitting diode, a buzzer or a horn, and an alarm signal is used to drive the above components to correspond The sound and light effects alert the production line personnel. Alternatively, in another embodiment, the detection module 11 is electrically connected to the processing device at the back end, for example, and the warning signal is used to provide relevant information to the back-end processing device for processing. It should be noted that the detection module 11 is an optional design compared to the power supply device 1, that is, the detection module 11 can be implemented in the power supply device 1 or detected. The module 11 can be a device or a circuit independent of the power supply device 1 and is not limited herein.

Please refer to FIG. 3. FIG. 3 is a functional block diagram of a power supply device with wiring protection according to another embodiment of the present invention. Figure 3 discloses a power supply device 1" with wiring protection. The power supply device 1" with wiring protection includes a switching module 12", a sensing resistor 14", a relay 17a", a relay 17b" and a shunt resistor 19". The switching module 12" is electrically connected to the power input terminal EP and the ground GND. The switching module 12" is configured to transmit electrical energy from the power input terminal EP to the power output terminal DV. One end of the sensing resistor 14" is electrically connected to the switching module 12". The other end of the sensing resistor 14" is electrically connected to the first Node N1". One end of the relay 17a" is electrically connected to the first node N1". The other end of the relay 17a" is electrically connected to the power output terminal DV. The shunt resistor 19" is connected in series to the relay 17b". The series-connected shunt resistor 19" and the relay 17b" are connected in parallel to the relay 17a".

Wherein, in an initial configuration phase, the switching module 12" is turned off and the relay 17a" is turned off. The switching module 12" is closed to switch the module 12" for a period of time without temporarily transferring power from the power input terminal EP to the power output terminal DV. The power supply device 1 ′′ determines whether an electronic device is correctly electrically connected to the power output terminal DV and the ground GND according to the voltage of the sensing resistor 14 ′′. The electronic device is, for example, a rechargeable battery or other electronic product having a storage capacity, and the following is exemplified by a rechargeable battery.

Referring to FIG. 4A, FIG. 4A is a schematic circuit diagram of a power supply device with wiring protection according to another embodiment of the present invention. The circuit structure of the power supply device 1" with wiring protection shown in Fig. 4A is substantially similar to the power supply device 1 with wiring protection shown in Fig. 2A. Unlike the embodiment shown in Fig. 2A, the third transistor M3 is replaced with a relay SWa, a relay SWb, and a shunt resistor R2 in the power supply device 2 having wiring protection. Both ends of the relay SWa are respectively connected to the first node N1" and the power output terminal DV. More specifically, in this embodiment, the relay SWa is electrically connected to the power output terminal DV via the fourth transistor M4". The details of the fourth transistor M4" are not described above. In this embodiment, the circuit structure composed of the first transistor M1" and the second transistor M2" is included in the foregoing switching module 12" The sense resistor R1" corresponds to the aforementioned sense resistor 14", the relay SWa corresponds to the aforementioned relay 17a", the relay SWb corresponds to the aforementioned relay 17b", and the shunt resistor R2" corresponds to the aforementioned shunt resistor 19".

Referring to FIG. 4B together, FIG. 4B is a schematic diagram of a current path when the power supply device with wiring protection shown in FIG. 4A is electrically connected to the rechargeable battery according to the present invention. As shown in FIG. 4B, the first electrode E1" of the rechargeable battery B is electrically connected to the ground GND and the second electrode E2" of the rechargeable battery B is electrically connected to the power output terminal DV". Similar to FIG. 4A, in FIG. 4B In the illustrated embodiment, the sense resistor R1" corresponds to the sense resistor 14" in FIG. 3, and the shunt resistor R2" corresponds to the shunt resistor 19" in FIG. 3, and the first relay SWa corresponds to FIG. The first relay 17a" and the second relay SWb correspond to the second relay 17b" in FIG.

As shown in FIG. 4B, in this embodiment, in the initial configuration phase, the first relay SWa is not turned on and the second relay SWb is turned on. At this time, the current I supplied from the rechargeable battery B is transmitted along the current path shown in FIG. 4B. More specifically, the current I" provided by the rechargeable battery B flows through the equivalent body diode D2" of the second transistor M2", the inductance L", the sense resistor R1", the shunt resistor R2, and the second Relay SWb and rechargeable battery B". In the case where the resistance values of the shunt resistor R2" and the sense resistor R1" are appropriately selected, the current value of the current I" can be effectively suppressed. On the other hand, by determining whether the voltage across the sense resistor R1" is greater than the corresponding value The threshold value can be judged whether the connection relationship between the power supply device 1" having the wiring protection and the rechargeable battery B is correct.

When the connection relationship between the rechargeable battery B and the power supply device 1" having the wiring protection is confirmed and the normal test flow is to be performed, the first relay SWa is turned on and the second relay SWb is turned on. To be disconnected to avoid power loss. By selectively turning on the second relay SWb, the power supply device 1" with wiring protection can provide a corresponding current path more accurately in different test stages. In addition to avoiding the circuit being burned by the user's mistake, it is more certain Avoid extra power consumption.

In summary, the present invention provides a power supply unit with wiring protection in which one of the electro-crystalline systems of the power supply unit with wiring protection operates in the ohmic region during the initial configuration phase. Therefore, when an abnormal situation occurs, for example, the line personnel reverse the output of the power supply device with the wiring protection and the electrode of the power take-off device, because the internal circuit of the power supply device with the wiring protection has a high impedance, thereby reducing the take-up The electrical device provides a discharge current to the power supply unit with wiring protection. Thereby, the power supply device with wiring protection can be prevented from being damaged due to human error of the line personnel. On the other hand, a power supply device with wiring protection has a sensing resistance. By measuring the voltage across the sense resistor, the line personnel can also know whether the connection between the power supply unit with wiring protection and the power take-off device is correct. Moreover, in the production line process, the initial configuration stage of the power supply unit with wiring protection can be used by the production line personnel to properly configure the test environment, and also provides a margin for the production line personnel.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1, 1" ‧‧‧Power supply unit with wiring protection

11, 11"‧‧‧Detection Module

12, 12"‧‧‧Switch Module

14, 14" ‧ ‧ sense resistor

16‧‧‧First power diode

162‧‧‧ Body diode

17a”, 17b”‧‧‧ first relay

18‧‧‧ diode

19”‧‧‧Shunt resistor

B‧‧‧Battery

C1, C1", C2, C2" ‧ ‧ capacitor

D1, D2, D3, D4, D1", D2", D3", D4" ‧‧‧ equivalent body diode

DV‧‧‧ power output

E1, E2, E1", E2", E1", E2" ‧ ‧ electrodes

EP‧‧‧ power input

GND‧‧‧ ground terminal

I, I" ‧ ‧ current

L‧‧‧Inductance

M1~M4, M1"~M4"‧‧‧O crystal

N1, N1"‧‧‧ first node

N2, N2"‧‧‧ second node

R1, R1", R2"‧‧‧ resistance

P‧‧‧Input power supply

SC1~SC4, SC1"~SC4"‧‧‧ control signals

SW, SWa, SWb‧‧‧ relay

FIG. 1 is a functional block diagram of a power supply device with wiring protection according to an embodiment of the invention. 2A is a circuit diagram of a power supply device with wiring protection according to an embodiment of the invention. 2B is a schematic diagram of a current path when the power supply device with wiring protection shown in FIG. 2A is electrically connected to the rechargeable battery according to the present invention. 3 is a functional block diagram of a power supply device with wiring protection according to another embodiment of the present invention. 4A is a circuit diagram of a power supply device with wiring protection according to another embodiment of the present invention. 4B is a schematic diagram of a current path when the power supply device with wiring protection shown in FIG. 4A is electrically connected to the rechargeable battery according to the present invention.

Claims (9)

A power supply device with wiring protection includes: a switching module electrically connected to a power input end and a ground end for transmitting electrical energy from the power input end to a power output end; a sense resistor, the sense One end of the measuring resistor is electrically connected to the switching module, and the other end of the sensing resistor is electrically connected to a first node; a first power transistor having a body diode between the two ends of the first power transistor And a diode, one end of the diode is electrically connected to one end of the same polarity of the body diode, and the diode is electrically connected to the first node and the power source Between the outputs. In the initial configuration stage, the switching module is turned off, the first power transistor is operated in the ohmic region, and the power supply device determines, according to the voltage of the sensing resistor, whether an electronic device is correctly electrically connected to the power output end and The ground terminal. The power supply device of claim 1, wherein the switching module comprises a first transistor and a second transistor, one end of the first transistor is electrically connected to the power input end, and the first transistor is further One end is electrically connected to the second node, and one end of the second transistor is electrically connected to the second node, and the other end of the second transistor is electrically connected to the ground. The power supply device of claim 1, further comprising an inductor and a capacitor, wherein one end of the inductor is electrically connected to a second node, and the other end of the inductor is electrically connected to one end of the sensing resistor, and one end of the capacitor is electrically The first node is connected to the first node, and the other end of the capacitor is electrically connected to the ground. The power supply device of claim 1, wherein the diode is a body diode of a second power transistor. A power supply device with wiring protection includes: a switching module electrically connected to a power input end and a ground end for transmitting electrical energy from the power input end to a power output end; a sense resistor, the sense One end of the measuring resistor is electrically connected to the switching module, and the other end of the sensing resistor is electrically connected to a first node; a first relay, one end of the first relay is electrically connected to the first node, the first relay The other end is electrically connected to the power output end; a shunt resistor, one end of the shunt resistor is electrically connected to the first node; a second relay is connected in series with the shunt resistor, and the first relay is connected in parallel to the second relay in series And the shunt resistor; and wherein, in an initial configuration phase, the switching module is turned off, the first relay is turned off, and the power supply device determines, according to the voltage of the sensing resistor, whether an electronic device is correctly electrically connected to the power output. End and the ground. The power supply device of claim 5, wherein the switching module comprises a first transistor and a second transistor, one end of the first transistor is electrically connected to the power input end, and the first transistor is further One end is electrically connected to the second node, and one end of the second transistor is electrically connected to the second node, and the other end of the second transistor is electrically connected to the ground. The power supply device of claim 5, further comprising an inductor and a capacitor, wherein one end of the inductor is electrically connected to a second node, and the other end of the inductor is electrically connected to one end of the sensing resistor, and one end of the capacitor is electrically The first node is connected, and the other end of the capacitor is electrically connected to the ground. The power supply device of claim 5, further comprising a diode, the diode being connected in series to the shunt resistor. The power supply device of claim 5, further comprising a diode, the diode being connected in series to the first relay.