TWI497869B - Power supply status detection module and method thereof - Google Patents

Description

Power interruption detection module and detection method thereof

The invention relates to a power detection module, in particular to a power interruption detection module and a detection method thereof.

Many electrical equipment are equipped with an emergency emergency power supply so that when the external power supply is lost, the electrical equipment can continue to operate with its own power. Generally, the above-mentioned power-consuming device is provided with a power detecting circuit for detecting whether the external power source loses power supply capability. When the power detecting circuit detects that the external power source cannot provide power, the standby power source is started to continue to supply power, so that the powering device can maintain normal operation.

Usually, the external power supply is connected in series with a power switch to control the supply of external power. However, when the power switch is turned off to stop the power device, the power supply detecting circuit will start the standby power source due to the loss of external power, and the power device cannot be surely stopped. In order to prevent this from happening, the backup power supply needs to be separately set, which is very inconvenient to use. Therefore, how to provide a power interruption detection module and its detection method to determine the cause of power interruption and avoid the above problem of not being able to reliably stop the operation of the power device has become one of the important issues.

In view of the above problems, an object of the present invention is to provide a power interruption detecting module and a detecting method thereof.

In order to achieve the above object, a power interruption detecting method according to the present invention is applied to a power supply system and a device. The power supply system includes a power source, a switch, a backup power source, and a power interruption detecting module, and the power interruption detecting module. The device includes a voltage limiting unit and a voltage detecting unit. The voltage limiting unit includes a voltage limiting component. The detecting method includes: detecting, by the voltage detecting unit, whether a voltage limiting voltage of the voltage limiting component is equal to zero. When the voltage detecting unit detects a voltage limiting voltage equal to 0 at a first time, the voltage detecting unit provides a first voltage signal to the voltage limiting component, and the first voltage signal has a first voltage. The voltage detecting unit detects whether the voltage limiting voltage of the voltage limiting component is less than the first voltage for a second time, and the second time is later than the first time. When the voltage limiting unit detects that the voltage limiting voltage is less than the first voltage at the second time, the voltage detecting unit outputs a power supply signal to the standby power source to supply the standby power source to the device.

In an embodiment, the voltage detecting unit further includes a detecting circuit and a supply circuit, wherein the detecting circuit detects the voltage limiting voltage of the voltage limiting component, and when the voltage limiting voltage is equal to 0 at the first time, detecting The measuring circuit outputs a start signal to the supply circuit, so that the supply circuit supplies the first voltage to the voltage limiting component.

In an embodiment, the first voltage signal is a direct current signal.

In an embodiment, the first voltage signal is an alternating current signal.

In an embodiment, the voltage limiting unit further includes a first current limiting resistor and a second current limiting resistor. One end of the first current limiting resistor is electrically connected to the switch, and the other end is electrically connected to the voltage limiting component. One end of the second current limiting resistor is electrically connected to the voltage limiting component and the first current limiting resistor, and the other end is electrically connected to the voltage detecting unit.

To achieve the above objective, a power interruption detecting module according to the present invention is applied to a power source, a switch, a backup power source, and a device. The switch is electrically connected to the power source and the device, and the backup power source is electrically connected to the device. The power interruption detection module includes a voltage limiting unit and a voltage detecting unit. The voltage limiting unit comprises a voltage limiting component, the voltage limiting component is electrically connected to the switch and the power source, and the voltage limiting component has a voltage limiting voltage. The voltage detecting unit is electrically connected to the voltage limiting component, and the voltage detecting unit is electrically connected to the standby power source. When the voltage detecting unit detects that the voltage limiting voltage is equal to 0 at a first time, the voltage detecting unit provides a first voltage signal to the voltage limiting component, the first voltage signal has a first voltage, and when the voltage is detected When the unit detects that the voltage limiting voltage is less than the first voltage at the second time after the first time, the voltage detecting unit outputs a power supply signal to the standby power source.

In an embodiment, the voltage detecting unit further includes a detecting circuit and a supplying circuit. The detecting circuit is electrically connected to the voltage limiting component, and the detecting circuit is electrically connected to the standby power source. The supply circuit is electrically connected to the detection circuit and the voltage limiting component. The detecting circuit detects whether the voltage limiting voltage is equal to 0, and when the detecting circuit detects that the voltage limiting voltage is equal to 0 at the first time, the detecting circuit outputs a starting signal to the supply circuit to control the supply circuit. The first voltage signal is supplied to the voltage limiting component.

In an embodiment, the power source further includes an internal resistance coupled to the voltage limiting component.

In an embodiment, the voltage limiting unit further includes a first current limiting resistor and a second current limiting resistor. One end of the first current limiting resistor is electrically connected to the switch, and the other end is electrically connected to the voltage limiting component. One end of the second current limiting resistor is electrically connected to the voltage limiting component and the first current limiting resistor, and the other end is electrically connected to the voltage detecting unit.

In an embodiment, the voltage limiting element is a Zener diode.

In summary, the power interruption detecting module and the detecting method thereof of the present invention determine the cause of the power interruption by detecting the change of the voltage limiting voltage of the voltage limiting component when the power supply system interrupts the power supply to the device. When the power supply capacity is lost, the backup power supply is activated to supply power to the device; if the user wants to stop the power supply, the backup power supply is not activated to stop the operation of the device. In this case, the standby power supply can be used without a separate switch, and is relatively easy to use.

1‧‧‧Power supply system
2‧‧‧Power interruption detection module
21‧‧‧Restriction unit
211‧‧‧Limited components
22‧‧‧Voltage detection unit
221‧‧‧Detection circuit
222‧‧‧Supply circuit
A‧‧‧end
E‧‧‧ equipment
P1‧‧‧ power supply
P2‧‧‧ standby power supply
R0‧‧‧ internal resistance
R1‧‧‧First current limiting resistor
R2‧‧‧second current limiting resistor
S0‧‧‧ start signal
S01, S02, S03, S04, S05‧‧ steps
S1‧‧‧First voltage signal
S2‧‧‧Power signal
SW‧‧ switch
T1‧‧‧ first time
T2‧‧‧ second time
V1‧‧‧ first voltage
VD‧‧‧voltage limiting voltage
Vi‧‧‧ voltage

FIG. 1 is a functional block diagram of a power interruption detecting module according to a preferred embodiment of the present invention.
2A and 2B are circuit diagrams of a power interruption detecting module according to a preferred embodiment of the present invention.
3A and 3B are schematic diagrams showing an equivalent circuit of a power interruption detecting module according to a preferred embodiment of the present invention.
3C and 3D are diagrams showing the voltage versus time of the voltage limiting element.
4A and FIG. 4B are equivalent circuit diagrams of a power supply system of a power interruption detecting module according to a preferred embodiment of the present invention.
4C and 4D are diagrams showing the voltage versus time of the voltage limiting element.
FIG. 5A is an equivalent circuit diagram of a power supply system of another power interruption detecting module according to a preferred embodiment of the present invention.
5B and 5C are diagrams showing the voltage versus time of the voltage limiting element.
FIG. 6 is a flow chart showing the steps of a power interruption detecting method according to a preferred embodiment of the present invention.

Hereinafter, a power interruption detecting module and a detecting method thereof according to a preferred embodiment of the present invention will be described with reference to the related drawings, wherein the same elements will be described with the same reference numerals.

FIG. 1 is a functional block diagram of a power interruption detecting module according to a preferred embodiment of the present invention. Referring to FIG. 1 , FIG. 2A and FIG. 2B , the power supply system 1 includes a power interruption detection module 2 , a power source P1 , a switch SW , and a backup power source P2 . In this embodiment, the power interruption detecting module 2 is applied in cooperation with the power source P1, the switch SW, the backup power source P2, and a device E. The power source P1 and the device E are respectively electrically connected to the switch SW. Here, the power supply to the device E can be controlled by the power source P1 through the switch SW. In addition, the backup power source P2 is electrically connected to the device E, and when the power source P1 loses the power supply capability, the backup power source P2 supplies power to the device E to continue operation. In addition, the power source P1 may be a direct current (as shown in FIG. 2A) or an alternating current (as shown in FIG. 2B), and the invention is not limited thereto.

In this embodiment, the power interruption detecting module 2 has a voltage limiting unit 21 and a voltage detecting unit 22. The voltage limiting unit 21 includes a voltage limiting component 211 having a voltage limiting voltage VD, and the switch SW and the power source P1 are electrically connected to the voltage limiting component 211, respectively. In addition, the voltage detecting unit 22 includes a detecting circuit 221 and a power supply circuit 222. The detecting circuit 221 is electrically connected to the voltage limiting component 211, the power supply circuit 222, and the backup power source P2, and the power supply circuit 222 is electrically connected to the limit. Pressing element 211.

In this embodiment, the detecting circuit 221 is configured to detect the voltage limiting voltage VD of the voltage limiting component 211, wherein the voltage limiting voltage VD varies according to the power supply state of the power supply system 1, and the detecting circuit 221 is based on the detecting The measured voltage-limiting voltage VD is changed to determine whether to output a start signal S0 to the supply circuit 222 to control the supply circuit 222 to provide a first voltage signal S1 to the voltage limiting component 211, wherein the first voltage signal S1 carries a first Voltage V1.

2A and FIG. 2B are schematic diagrams showing a circuit of a power interruption detecting module according to a preferred embodiment of the present invention. FIG. 2A is a schematic diagram of a power source P1 when it is a DC power source, and FIG. 2B is a schematic diagram of a power source P1 when it is an AC power source. Referring to FIG. 2A and FIG. 2B, in the embodiment, the voltage limiting unit 21 of the power interruption detecting module 2 further includes a first current limiting resistor R1 and a second current limiting resistor R2. In addition, in the present embodiment, the voltage limiting element 211 is a Zener diode having an anode end grounded, a cathode end electrically connected to one end of the first current limiting resistor R1, and a first current limiting resistor R1 at the other end. Electrically connected to the output end of the switch SW, and the second current limiting resistor R2 is electrically connected to the cathode end of the voltage limiting component 211 and the first current limiting resistor R1, and the other end is electrically connected to the voltage detecting unit. Supply circuit 222 of 22. In addition, the power source P1 further includes an internal resistance R0, and one end thereof is coupled to the anode end of the voltage limiting element 211. It should be noted that the voltage limiting component 211 of the embodiment is a Zener diode, and the breakdown voltage is greater than the first voltage V1.

3A and FIG. 3B are respectively equivalent circuit diagrams of the power supply system of FIG. 2A and FIG. 2B under the normal power supply state of the power source P1 and the switch SW being closed. 3C and 3D are diagrams showing voltage versus time of the voltage limiting element 211, wherein FIG. 3C is when the power source P1 is DC power, and FIG. 3D is when the power source P1 is AC power. Referring to FIG. 3A, when the power supply P1 is normally powered, and the switch SW is closed, the device E is in a normal operating state. In this state, the detecting circuit 221 detects that the voltage limiting voltage VD of the voltage limiting component 211 is the voltage Vi of the voltage of the power source P1 divided by the first current limiting resistor R1, and according to the power source P1, it is a direct current or an alternating current, respectively. Figure 3C or 3D shows.

FIG. 4A is an equivalent circuit diagram of the power supply system 1 when the power source P1 of the power supply system 1 loses power supply capability. 4C and FIG. 4D are diagrams showing voltage versus time of the voltage limiting element 211, wherein FIG. 4C is when the power source P1 is DC power and the power source P1 of FIG. 4D is AC power. Please refer to FIG. 4A, FIG. 4C and FIG. 4D at the same time. Generally speaking, when the power supply system 1 does not end its power supply capability as expected by the user, for example, when the power is cut off or the power source P1 is damaged, in order to enable the device E to maintain normal operation, The backup power supply P2 is required to supply power to device E. In the present embodiment, since the power source P1 loses the power supply capability, the voltage limiting voltage VD of the voltage limiting element 211 is zero. When the detecting circuit 221 detects that the voltage limiting voltage VD of the voltage limiting component 211 is equal to 0 at a first time T1, the detecting circuit 221 outputs an activation signal S0 to the supply circuit 222, and the supply circuit 222 receives the startup signal S0. The first voltage signal S1 is provided to the voltage limiting component 211, wherein the first voltage signal S1 carries a first voltage V1.

As described above, since the supply circuit 222 supplies the first voltage V1 to the voltage limiting element 211, the circuit relationship between the supply circuit 222 and the voltage limiting element 211 at this time can be equivalent to the equivalent circuit diagram illustrated in FIG. 4B. Referring to FIG. 4A and FIG. 4B simultaneously, since the switch SW is closed, it can be equivalent to the first current limiting resistor R1 being connected in series with the internal resistance R0, and then connected in parallel with the voltage limiting element 211, that is, as shown in FIG. 4B. Next, the detecting circuit 221 measures the voltage limiting voltage VD of the voltage limiting element 211 at the terminal end a at a second time T2, that is, the voltage after the first voltage V1 is divided by the second current limiting resistor R2. In other words, the voltage limiting voltage VD is less than the first voltage V1 at this time. In this embodiment, when the detecting circuit 221 measures that the voltage limiting voltage VD is less than the first voltage V1, the detecting circuit 221 outputs a power supply signal S2 to the standby power source P2 to supply the backup power source P2 to the device E.

It should be noted that the first time T1 of the embodiment is the time point when the detecting circuit 221 detects that the voltage limiting voltage VD is equal to 0, that is, the time point when the power source P1 loses the power supply capability. In addition, the second time T2 is any time point after the supply circuit 222 supplies the first voltage signal S1 to the voltage limiting element 211.

In short, when the power supply P1 loses the power supply capability, the detecting circuit 221 measures that the voltage limiting voltage VD is equal to 0, and the detecting circuit 221 controls the supply circuit 222 to provide the first voltage V1 to the voltage limiting element 211; When the measuring circuit 221 measures that the voltage limiting voltage VD is smaller than the first voltage V1, the standby power source P2 is activated to supply power to the device E. In addition, the first voltage signal S1 provided by the supply circuit 222 is exemplified by a direct current signal, preferably a fixed voltage signal. In other embodiments, the AC signal can be implemented by an AC signal, preferably a pulse wave signal. When the supply circuit 222 outputs a high potential pulse wave, the detection circuit 221 measures the voltage limiting voltage VD, which is not limited by the present invention. .

5A is an equivalent circuit diagram of the power supply system 1 when the switch SW of the power supply system 1 shown in FIG. 2A or 2B is in an open state, and FIGS. 5B and 5C are voltage and time diagrams of the voltage limiting element 211. 5B is when the power source P1 is DC power, and FIG. 5C is when the power source P1 is AC power. Referring to FIG. 2 and FIG. 5A simultaneously, when the user wants to end the power supply P1 to supply power to the device E, the user can turn off the switch SW to open the circuit to end the power supply of the power supply P1. At this time, the equivalent circuit diagram of the power supply system 1 is as shown in FIG. 5A is shown. Referring to FIG. 5A to FIG. 5C simultaneously, since the switch SW is in an open state at this time, the voltage limiting voltage VD of the voltage limiting element 211 is zero. When the detecting circuit 221 detects that the voltage limiting voltage VD of the voltage limiting component 211 is equal to 0 at a first time T1, the detecting circuit 221 outputs an activation signal S0 to the supply circuit 222, and the supply circuit 222 receives the startup signal S0. The first voltage signal S1 is provided to the voltage limiting component 211, wherein the first voltage signal S1 carries a first voltage V1.

After the supply circuit provides the first voltage signal S1, since the first voltage V1 is smaller than the breakdown voltage of the voltage limiting element 211, the voltage limiting element 211 is not turned on, so the current cannot flow through the voltage limiting element 211 to form a loop, so that the current can be regarded as The voltage limiting element 211 is an open circuit. Here, the detection circuit 221 measures the voltage-limiting voltage VD of the voltage limiting element 211 at the second time T2 as the first voltage V1. In other words, the voltage limiting voltage VD is equal to the first voltage V1 at this time. In this embodiment, when the detecting circuit 221 measures that the voltage limiting voltage VD is equal to the first voltage V1, the detecting circuit 221 determines that the state is that the user wants to stop supplying power to the device E, and therefore does not activate the standby power source P2.

In short, when the user turns off the switch SW to open circuit, it means that the user wants to stop supplying power to the device E. When the detecting circuit 221 detects that the voltage limiting voltage VD is equal to 0, the detecting circuit 221 controls the supply circuit 222. The first voltage V1 is supplied to the voltage limiting element 211. Then, when the detecting circuit 221 measures that the voltage limiting voltage VD is equal to the first voltage V1, the standby power source P2 is not activated, and the device E is not supplied.

FIG. 6 is a flow chart showing the steps of a power interruption detecting method according to a preferred embodiment of the present invention. Referring to FIG. 6, the detecting method of the present embodiment is applied to the power supply system 1 and the power interruption detecting module 2 and the device E of the above embodiment, and the operation of the power supply system 1 and the device E is as described above. No longer. The detection method of the present invention is as follows: according to step S01, the detection circuit 221 of the voltage detecting unit 22 detects whether a voltage limiting voltage VD of the voltage limiting component 211 is equal to 0, and if the voltage limiting voltage VD is not equal to 0, Then, the power supply system 1 maintains a normal operating state as shown in step S05. In more detail, the voltage limiting voltage VD during normal operation is greater than the first voltage V1 provided by the supply circuit 222.

In step S02, when the voltage limiting voltage VD detected by the detecting circuit 221 of the voltage detecting unit 22 is equal to 0 at a first time T1, for example, the power supply P1 is determined for the reason that the voltage limiting voltage VD is 0. If the power supply capability is lost or the switch SW is open, the detection circuit 221 of the voltage detecting unit 22 outputs an activation signal S0 to the supply circuit 222, so that the supply circuit 222 provides a first voltage signal S1 to the voltage limiting component 211, wherein A voltage signal S1 carries a first voltage V1. It should be noted that the first time T1 in this embodiment is the time when the detecting circuit 221 detects that the voltage limiting voltage VD is equal to 0, which may be the time when the power supply P1 loses the power supply capability, or the time when the switch SW is open. point.

Then, in step S03, the detecting circuit 221 of the voltage detecting unit 22 detects whether the voltage limiting voltage VD of the voltage limiting component 211 is less than the first voltage V1 at a second time T2, wherein the second time T2 is later than the first time T1. . It should be noted that the second time T2 is any time point after the supply circuit 222 supplies the first voltage signal S1 to the voltage limiting element 211. In step S04, when the voltage-limiting voltage VD detected by the detecting circuit 221 of the voltage detecting unit 22 is less than the first voltage V1 at the second time T2, it indicates that the power source P1 loses the power supply capability, and thus the voltage detecting unit 22 The detecting circuit 221 outputs a power supply signal S2 to the standby power source P2 to supply the backup power source P2 to the device E to maintain the operation of the device E. In contrast, if the voltage limiting voltage VD detected at the second time T2 is equal to the first voltage V1, the user opens the switch SW and stops supplying power to the device E, which is normal use, so the standby power source P2 is not activated. The state of the power supply system 1 is maintained as in step S05.

In summary, the power interruption detecting module and the detecting method thereof of the present invention determine the cause of the power interruption by detecting the change of the upper limit voltage of the voltage limiting component when the power supply system interrupts the power supply to the device, and if the power is lost, When the power supply capability is enabled, the backup power supply is activated to supply power to the device; if the user wants to stop the power supply, the backup power supply is not activated to stop the operation of the device. In this case, the standby power supply can be used without a separate switch, and is relatively easy to use.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

S01, S02, S03, S04, S05‧‧ steps

Claims (10)

A power interruption detection method is applied to a power supply system and a device, the power supply system includes a power source, a switch, a backup power source, and a power interruption detection module, wherein the power interruption detection module includes a voltage limiting unit and a voltage a detecting unit, the pressure limiting unit includes a pressure limiting component, and the detecting method comprises:
The voltage detecting unit detects whether a voltage limiting voltage of the voltage limiting component is equal to 0;
When the voltage detecting unit detects the voltage limiting voltage equal to 0 at a first time, the voltage detecting unit provides a first voltage signal to the voltage limiting component, and the first voltage signal carries a first Voltage;
The voltage detecting unit detects whether the voltage limiting voltage of the voltage limiting component is less than the first voltage at a second time, the second time is later than the first time; and when the voltage detecting unit is in the When the voltage limiting voltage detected in the second time is less than the first voltage, the voltage detecting unit outputs a power supply signal to the standby power source to supply the standby power source to the device. The detection method of claim 1, wherein the voltage detecting unit further comprises a detecting circuit and a supply circuit, wherein the detecting circuit detects the voltage limiting voltage of the voltage limiting component, and when the limit When the voltage is equal to 0, the detecting circuit outputs an activation signal to the supply circuit, so that the supply circuit supplies the first voltage signal to the voltage limiting component. The detection method of claim 1, wherein the first voltage signal is a direct current signal. The detection method of claim 1, wherein the first voltage signal is an alternating current signal. The detection method of claim 1, wherein the pressure limiting unit further comprises:
a first current limiting resistor, one end of which is electrically connected to the switch, the other end is electrically connected to the voltage limiting component; and a second current limiting resistor, one end of which is electrically connected to the voltage limiting component and the first limit The current resistor is electrically connected to the voltage detecting unit at the other end. A power interruption detection module is applied to a power source, a switch, a backup power source, and a device, the switch is electrically connected to the power source and the device, and the backup power source is electrically connected to the device, and the power interruption detection is Modules include:
a voltage limiting unit comprising a voltage limiting component electrically connected to the switch and the power source, the voltage limiting component having a voltage limiting voltage; and a voltage detecting unit electrically connected to the limiting a voltage component, and the voltage detecting unit is electrically connected to the standby power source;
When the voltage detecting unit detects that the voltage limiting voltage is equal to 0 at a first time, the voltage detecting unit provides a first voltage signal to the voltage limiting component, and the first voltage signal has a first voltage. And when the voltage detecting unit detects that the voltage limiting voltage is less than the first voltage at a second time after the first time, the voltage detecting unit outputs a power supply signal to the standby power source. The power interruption detecting module of claim 6, wherein the voltage detecting unit further comprises:
a detecting circuit electrically connected to the voltage limiting component, wherein the detecting circuit is electrically connected to the standby power source; and a supply circuit electrically connected to the detecting circuit and the voltage limiting component;
The detecting circuit detects whether the voltage limiting voltage is equal to 0, and when the detecting circuit detects the voltage limiting voltage equal to 0 at the first time, the detecting circuit outputs a start signal to The supply circuit controls the supply circuit to provide the first voltage signal to the voltage limiting component. The power interruption detecting module of claim 6, wherein the power source further comprises an internal resistance coupled to the voltage limiting component. The power interruption detecting module of claim 6, wherein the voltage limiting unit further comprises:
a first current limiting resistor, one end of which is electrically connected to the switch, the other end is electrically connected to the voltage limiting component; and a second current limiting resistor, one end of which is electrically connected to the voltage limiting component and the first limit The current resistor is electrically connected to the voltage detecting unit at the other end. The power interruption detecting module according to claim 6, wherein the voltage limiting element is a Zener diode.