CN109917162B - Power supply protection circuit and testing device - Google Patents
Power supply protection circuit and testing device Download PDFInfo
- Publication number
- CN109917162B CN109917162B CN201910229080.0A CN201910229080A CN109917162B CN 109917162 B CN109917162 B CN 109917162B CN 201910229080 A CN201910229080 A CN 201910229080A CN 109917162 B CN109917162 B CN 109917162B
- Authority
- CN
- China
- Prior art keywords
- pin
- power supply
- switch
- terminal
- communication path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 238000004891 communication Methods 0.000 claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 9
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 4
- 230000005669 field effect Effects 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Landscapes
- Electronic Switches (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a power supply protection circuit and a testing device, wherein the power supply protection circuit comprises: the relay comprises a power supply end, a power supply end and a current path between the power supply end and the power supply end, wherein when the current path is conducted, the power supply end provides direct-current voltage for the power supply end, and when the current path is disconnected, the power supply end is suspended; the control module controls the on and off of the current path according to the switch control signal; and the switch detection module comprises a first communication path and a second communication path, and provides an invalid switch control signal to turn off the current path through one of the first communication path and the second communication path when the power supply end is powered on, and provides an effective switch control signal to turn on the current path when the other of the first communication path and the second communication path is turned on, so that the phenomenon of burning out a load in the subsequent test due to the fact that a tester forgets to switch the switch to a turn-off gear after the test is finished can be avoided, and the test efficiency and the safety are improved.
Description
Technical Field
The invention relates to the technical field of power protection, in particular to a power protection circuit and a testing device.
Background
In the existing production process of electronic devices, it is necessary to test each module in the electronic devices, for example, to test the power-on condition of each module. During testing, a direct current power supply is generally adopted to supply power to the testing device, and a switch is connected between the direct current power supply and the testing device to control the on-off of the power supply. However, if the tester forgets to switch the switch to the off position after the test is finished, the current in the test device will be increased by the large current at the dc power supply when the tester connects the test device to the dc power supply in the next test, and the test device will be burned out, resulting in property loss.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a power protection circuit and a testing apparatus, which can effectively avoid a phenomenon that a load is burned out in a subsequent test due to a tester forgetting to switch a switch to an off-position after a previous test is completed, and improve efficiency and safety of the test.
According to an aspect of an embodiment of the present invention, there is provided a power protection circuit including: the relay comprises a power supply end, a power supply end and a current path between the power supply end and the power supply end, wherein when the current path is conducted, the power supply end provides direct-current voltage for the power supply end, and when the current path is disconnected, the power supply end is suspended; the control module is used for controlling the on and off of the current path according to the switch control signal; and a switch detection module including a first communication path and a second communication path for providing the switch control signal that is inactive to turn off the current path via one of the first communication path and the second communication path when the power source terminal is powered on, and providing the switch control signal that is active to turn on the current path when the other of the first communication path and the second communication path is turned on.
Preferably, the relay further comprises a first control terminal and a second control terminal connected to the control module, the current path is turned on when voltages of the first control terminal and the second control terminal are equal, and the current path is turned off when the voltages of the first control terminal and the second control terminal are not equal.
Preferably, the control module comprises: a diode having an anode connected to the second control terminal and a cathode connected to the first control terminal and a power supply voltage; the switch tube is connected between the anode of the diode and the ground in series, and the control end of the switch tube is connected to the switch detection module to receive the switch control signal; and the first end of the first resistor is connected to the control end of the switch tube, and the second end of the first resistor is grounded, wherein when the switch control signal is invalid, the switch tube is switched off, the voltages of the first control end and the second control end are equal, when the switch control signal is valid, the switch tube is switched on, and the voltages of the first control end and the second control end are not equal.
Preferably, the switch detection module includes: the charging unit is used for obtaining a charging voltage according to the power supply voltage; a signal generating unit for generating the switch control signals which are valid and invalid according to the charging voltage; and a switching unit for turning on the first communicating path or the second communicating path to output as the switching control signal.
Preferably, the charging unit includes a second resistor and a capacitor connected in series between the power supply voltage and ground, and an intermediate node of the second resistor and the capacitor outputs the charging voltage.
Preferably, the switch unit includes first to eighth pins, the second pin is configured to receive the charging voltage, the first pin and the third pin are respectively connected to an input terminal of the signal generation unit to respectively provide the charging voltage to the signal generation unit, the fourth pin and the sixth pin are respectively connected to an output terminal of the signal generation unit to receive the switch control signal, the fifth pin is connected to a control terminal of the switch tube, and the seventh pin and the eighth pin are grounded, where when the first communication path is turned on, the first pin is communicated with the second pin, the fifth pin is communicated with the sixth pin, and when the second communication path is turned on, the second pin is communicated with the third pin, and the fourth pin is communicated with the fifth pin.
Preferably, the signal generating unit includes a first nand gate, a second nand gate, a third resistor, and a fourth resistor, the first NAND gate comprises a first input end, a second input end and a first output end, the first input end is connected to the first pin, the first output end is connected to the sixth pin, the second NAND gate comprises a third input end, a fourth input end and a second output end, the third input terminal is connected to the second input terminal of the first NAND gate, the fourth input terminal is connected to the third pin, the second output end is connected to the fourth pin, a first end of the third resistor is connected to the first input end of the first NAND gate, a second end of the third resistor is connected to the power supply voltage, the first end of the fourth resistor is connected to the power supply voltage, and the second end of the fourth resistor is connected to the fourth input end of the second nand gate.
Preferably, the switching unit comprises a double pole double throw switch.
Preferably, the switching tube is a P-type metal oxide field effect transistor.
According to another aspect of the embodiments of the present invention, a testing apparatus is provided, which includes the power protection circuit described above.
The power supply protection circuit and the testing device provided by the embodiment of the invention have the following beneficial effects.
At the initial stage of power-on of each test, no matter what switching state the switching unit is in, the current path between the rear-stage load and the direct-current interface is disconnected, and the current path between the rear-stage load and the direct-current interface can be switched on only when the switching unit is switched on again, so that the phenomenon that the load is burned out due to the fact that the current in the load is instantly increased in the subsequent test because a tester forgets to switch the switch to the switch-off gear after the previous test is finished can be effectively avoided, and the efficiency and the safety of the test are improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a power protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power protection circuit structure with a switch unit in a first communication path at power-on;
fig. 3 shows an operation timing diagram of the power protection circuit in which the switching unit is in the first communication path at the time of power-on;
fig. 4 shows a schematic diagram of a power protection circuit configuration in which the switching unit is in the second communication path at power-on;
fig. 5 shows an operation timing chart of the power supply protection circuit in which the switching unit is in the second communicating path at the time of power-on.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.
In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of components, are set forth in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through an electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Fig. 1 shows a schematic structural diagram of a power protection circuit according to an embodiment of the present invention.
As shown in fig. 1, the power protection circuit includes a relay 110, a control module 120, and a switch detection module 130.
The relay 110 includes a power supply terminal, and a current path between the power supply terminal and the power supply terminal. The power supply terminal of the relay 110 is connected to the dc interface to receive the input dc voltage Vin, and the power supply terminal of the relay 110 is connected to the subsequent load to provide the output dc voltage Vout to the load. When the current path is switched on, the power supply end provides direct-current voltage for the power supply end, and when the current path is switched off, the power supply end is suspended.
The control module 120 is configured to control the current path to be turned on or off according to the switch control signal.
The switch detecting module 130 includes a first communication path and a second communication path for providing an invalid switch control signal to turn off the current path via one of the first communication path and the second communication path when the power source terminal is powered on. And the switch control signal provided when the other of the first communicating path and the second communicating path is turned on to turn on the current path. In order to guarantee at the power-on stage of each test, no matter which on-off state the switch in the switch detection module is, the current path between the rear-stage load and the direct current interface is disconnected, can avoid because of the tester forgets to switch over the switch to the shutoff gear after the last test, and the electric current in the rear-stage load increases in the twinkling of an eye, burns out the rear-stage load.
As a non-limiting example, the relay 110 includes a power supply terminal C, a first control terminal a1, a second control terminal a2, a first power supply terminal K1, and a second power supply terminal K2. The power terminal C is connected to the dc interface to receive the input dc voltage Vin, the first control terminal a1 and the second control terminal a2 are connected to the control module 120, the first power terminal K1 is connected to the rear stage load to provide the output dc voltage Vout, and the second power terminal K2 is floating. When the current path is turned on, the power supply terminal C is connected to the first power supply terminal K1, and when the current path is turned off, the power supply terminal C is connected to the second power supply terminal K2.
In addition, the control module 120 controls the current path to be turned on and off by controlling the voltage difference between the first control terminal a1 and the second control terminal a 2. For example, when the voltages of the first control terminal a1 and the second control terminal a2 are equal, no current flows in the coil in the relay, the power supply terminal C is connected with the second power supply terminal K2, and the current path is disconnected; when the voltages of the first control terminal a1 and the second control terminal a2 are not equal, a current flows through the coil in the relay, the power supply terminal C is connected to the first power supply terminal K2, and the current path is turned on.
As a non-limiting example, the control module 120 includes a diode D1, a switching tube M1, and a first resistor R1. The diode D1 has an anode connected to the second control terminal a2 and a cathode connected to the first control terminal a1 and the power supply voltage VCC. The switch M1 is connected in series between the anode of the diode D1 and ground, and the control terminal of the switch is connected to the switch detection module 130 for receiving the switch control signal. The first resistor R1 has a first terminal connected to the control terminal of the switch M1 and a second terminal connected to ground.
The switching transistor M1 is implemented by, for example, a PMOS transistor (P-Metal Oxide Semiconductor), and can be turned on and off according to the level state of the switching control signal. For example, when the switch control signal is inactive (e.g., high), the switch transistor M1 is turned off, the ground path of the anode of the diode D1 is disconnected, and the voltages of the first control terminal a1 and the second control terminal a2 are equal. When the switch control signal is active (e.g., low), the switch transistor M1 is turned on, the anode of the diode D1 is grounded, the voltage of the second control terminal a2 is pulled low, and the voltages of the first control terminal a1 and the second control terminal a2 are not equal.
It should be noted that the type of the switching tube M1 is not limited to this embodiment, and in other embodiments of the present invention, the switching tube M1 may also be implemented by an NMOS (N-Metal Oxide Semiconductor, N-type Metal Oxide field effect transistor). When the switch control signal is inactive (e.g., low), the switch transistor M1 is turned off, the ground path of the anode of the diode D1 is disconnected, and the voltages of the first control terminal a1 and the second control terminal a2 are equal. When the switch control signal is active (e.g., high), the switch transistor M1 is turned on, the anode of the diode D1 is grounded, the voltage of the second control terminal a2 is pulled low, and the voltages of the first control terminal a1 and the second control terminal a2 are not equal.
As a non-limiting example, the switch detecting module 130 includes a charging unit 131, a signal generating unit 132, and a switching unit 133. The charging unit 131 is configured to obtain a charging voltage according to the power supply voltage VCC. The signal generating unit 132 is configured to generate the invalid or valid switch control signal according to the charging voltage. The switching unit 133 is configured to output the switching control signal via the first communicating path or the second communicating path.
Illustratively, the charging unit 131 includes a second resistor R2 and a capacitor C1 connected in series between the power supply voltage VCC and the ground, and an intermediate node Q between the second resistor R2 and the capacitor C1 is used for outputting the charging voltage.
The signal generating unit 132 includes a first nand gate 103, a second nand gate 104, a third resistor R3, and a fourth resistor R4. The first nand gate 103 comprises a first input terminal B1, a second input terminal B2 and a first output terminal Y1, wherein the first input terminal B1 is used for receiving the charging voltage, and the first output terminal Y1 is used for providing the switch control signal. The second nand gate 104 comprises a third input B3, a fourth input B4 and a second output Y2, wherein the third input B3 is connected to the second input B2 of the first nand gate 103, the fourth input B4 is configured to receive the charging voltage, and the second output Y2 is configured to output the switch control signal. The first end of the third resistor R3 is connected to the first input terminal B1 of the first nand gate 103, and the second end is connected to the power supply voltage VCC. The fourth resistor R4 has a first terminal connected to the power supply voltage VCC and a second terminal connected to the fourth input terminal B4 of the second nand gate 104.
The switching unit 133 includes first to eighth pins 1 to 8. The second pin 2 is connected to the middle node Q of the second resistor R2 and the capacitor C1 to receive the charging voltage. The first pin 1 and the third pin 3 are respectively connected to the first input B1 of the first nand gate 103 and the fourth input B4 of the second nand gate 104 to respectively supply the charging voltage to the first nand gate 103 and the second nand gate 104. The fourth pin 4 and the sixth pin 6 are respectively connected to the first output terminal Y1 of the first nand gate 103 and the second output terminal Y2 of the second nand gate 104 to receive the switch control signal. The fifth pin 5 is connected to the control terminal of the switching tube M1, and the seventh pin 7 and the eighth pin 8 are grounded.
The switching unit 133 is implemented by, for example, a double-pole double-throw switch, and includes a first communication path and a second communication path. When the first communication path is conducted, the first pin 1 is communicated with the second pin 2, and the fifth pin 5 is communicated with the sixth pin 6. When the second communicating path is conducted, the second pin 2 is communicated with the third pin 3, and the fourth pin 4 is communicated with the fifth pin 5.
Fig. 2 and fig. 3 respectively show a schematic structural diagram and an operation timing diagram of the power protection circuit when the switch unit is in the first communication path at power-on. The operation principle of the power protection circuit according to the embodiment of the present invention will be described in detail with reference to fig. 2 and 3.
In the timing chart shown in FIG. 3, VQIndicating the charging voltage, V, output by the charging unitY1Representing the voltage, V, at the output of the first NAND-gate 103Y2Representing the voltage at the output of the second NAND-gate, Vgate representing the switch control signal, VA1And VA2Respectively, representing the voltages of the first control terminal and the second control terminal of the relay 110.
As shown in fig. 2, it is assumed that the first connection path is turned on in the initial power-up stage, that is, the first pin 1 and the second pin 2 of the switch unit are connected, and the fifth pin 5 and the sixth pin 6 are connected.
During the time period t1-t2, the power protection circuit starts to power up, the power voltage VCC charges the capacitor C1 through the second resistor R2, and the charging voltage has a process of changing from low level to high level. Since the first pin 1 and the second pin 2 of the switch unit 133 are connected at this time, the first input terminal B1 of the first nand gate 103 inputs a low level, and the first output terminal Y1 of the first nand gate 103 outputs a high level (i.e., the first output terminal Y1 outputs an inactive switch control signal). The first output terminal Y1 of the first nand gate 103 is connected to the sixth pin of the switch unit 133 and the third input terminal B3 of the second nand gate 104, and the sixth pin 6 is connected to the fifth pin 5, so that the fifth pin 5 outputs a high-level switch control signal (i.e., the fifth pin 5 outputs an inactive switch control signal), and the switch tube M1 is turned off. In the relay 110, the voltages of the first control end a1 and the second control end a2 are equal, the power supply end C is communicated with the second power supply end K2, and the output direct-current voltage Vout is at a low level.
In the time period t2-t3, the second communication path is turned on, that is, the second pin 2 and the third pin 3 of the switch unit 133 are communicated at this time, and the fourth pin 4 and the fifth pin 5 are communicated. At this time, the third input terminal of the second nand gate 104 is at a high level, and since the fourth resistor R4 is a pull-up resistor, the fourth input terminal B4 of the second nand gate 104 is also at a high level, and the second output terminal Y2 of the second nand gate 104 outputs a low level (i.e., the second output terminal Y2 outputs an active switch control signal). Since the second output terminal Y2 of the second nand gate 104 is connected to the fourth pin 4, and the fourth pin 4 is connected to the fifth pin 5, the fifth pin 5 outputs a low-level switch control signal (i.e., the fifth pin 5 outputs an active switch control signal), the switch tube M1 is turned on, and the anode of the diode D1 is grounded. The voltage of the first control end A1 and the second control end A2 in the relay 110 is unequal, the power supply end C is communicated with the second power supply end K1, the relay 110 supplies power for a rear-stage load, and the output direct-current voltage Vout becomes high level.
During the time period t3-t4, the first connection path is turned on again, the fifth pin 5 goes high again, and the switch M1 is turned off. In the relay 110, the voltages of the first control terminal a1 and the second control terminal a2 are equal, the power supply terminal C is connected to the second power supply terminal K2, and the output dc voltage Vout becomes low again. When the second communication path is turned on again, the fifth pin 5 goes low again, and the switch M1 is turned on. The voltage of the first control end a1 and the second control end a2 in the relay 110 is not equal, the power supply end C is communicated with the first power supply end K1, the output direct-current voltage Vout becomes high level again, and so on.
Fig. 4 and 5 show a schematic structural diagram and an operation timing chart of the power protection circuit in which the switching unit is in the second communication path at the time of power-on, respectively. The operation principle of the power protection circuit according to the embodiment of the present invention will be described in detail with reference to fig. 4 and 5.
Similarly, in the timing chart shown in FIG. 5, VQIndicating the charging voltage, V, output by the charging unitY1Representing the voltage, V, at the output of the first NAND-gate 103Y2Representing the voltage at the output of the second NAND-gate, Vgate representing the switch control signal, VA1And VA2Respectively, representing the voltages of the first control terminal and the second control terminal of the relay 110.
As shown in fig. 4, it is assumed that the second communication path is turned on in the initial power-up stage, that is, the second pin 2 and the third pin 3 of the switch unit are communicated, and the fourth pin 4 and the fifth pin 5 are communicated.
During the time period t1-t2, the power protection circuit starts to power up, the power voltage VCC charges the capacitor C1 through the second resistor R2, and the charging voltage has a process of changing from low level to high level. Since the second pin 2 and the third pin 3 of the switch unit 133 are connected at this time, the fourth input terminal B4 of the second nand gate 104 inputs a low level, and the second output terminal Y2 of the second nand gate 104 outputs a high level (i.e., the second output terminal Y2 outputs an inactive switch control signal). The second output terminal Y2 of the second nand gate 104 is connected to the fourth pin of the switch unit 133 and the second input terminal B2 of the first nand gate 103, and the fourth pin 4 is connected to the fifth pin 5, so that the fifth pin 5 outputs a high-level switch control signal (i.e., the fifth pin 5 outputs an inactive switch control signal), and the switch tube M1 is turned off. In the relay 110, the voltages of the first control end a1 and the second control end a2 are equal, the power supply end C is communicated with the second power supply end K2, and the output direct-current voltage Vout is at a low level.
In the time period t2-t3, the first connection path is turned on, that is, the second pin 2 and the first pin 1 of the switch unit 133 are connected, and the sixth pin 6 and the fifth pin 5 are connected. At this time, the second input terminal B2 of the first nand gate 103 is at a high level, and since the third resistor R3 is a pull-up resistor, the first input terminal B1 of the first nand gate 103 is also at a high level, and the first output terminal Y1 of the first nand gate 103 outputs a low level (i.e., the first output terminal Y1 outputs an active switch control signal). Since the first output terminal Y1 of the first nand gate 103 is connected to the sixth pin 6, and the sixth pin 6 is connected to the fifth pin 5, the fifth pin 5 outputs a low-level switch control signal (i.e., the fifth pin 5 outputs an active switch control signal), the switch tube M1 is turned on, and the anode of the diode D1 is grounded. The voltage of the first control end A1 and the second control end A2 in the relay 110 is unequal, the power supply end C is communicated with the second power supply end K1, the relay 110 supplies power for a rear-stage load, and the output direct-current voltage Vout becomes high level.
At time period t3-t4, the second communication path is turned on again, the fifth pin 5 goes high again, and the switch tube M1 is turned off. In the relay 110, the voltages of the first control terminal a1 and the second control terminal a2 are equal, the power supply terminal C is connected to the second power supply terminal K2, and the output dc voltage Vout becomes low again. When the first connection path is turned on again, the fifth pin 5 goes low again, and the switch M1 is turned on. The voltage of the first control end a1 and the second control end a2 in the relay 110 is not equal, the power supply end C is communicated with the first power supply end K1, the output direct-current voltage Vout becomes high level again, and so on.
TABLE 1
Table 1 shows a truth table of a power protection circuit of an embodiment of the present invention. As shown in table 1, in the power protection circuit according to the embodiment of the invention, in the initial power-on stage of each test, no matter what switching state the switching unit is, the current path between the rear-stage load and the dc interface is disconnected, and only when the current path between the rear-stage load and the dc interface is switched to be switched again, the current path between the rear-stage load and the dc interface can be switched on, so that the phenomenon that the load is burned out due to the instantaneous increase of the current in the load in the subsequent test caused by forgetting to switch the switch to the off gear after the previous test is finished can be effectively avoided, and the efficiency and the safety of the test are improved.
According to another aspect of the present invention, a testing apparatus is provided, which includes the power protection circuit of the above embodiment, and as such, the safety and efficiency of the testing apparatus can be effectively improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A power protection circuit, comprising:
the relay comprises a power supply end, a power supply end and a current path between the power supply end and the power supply end, wherein when the current path is conducted, the power supply end provides direct-current voltage for the power supply end, and when the current path is disconnected, the power supply end is suspended;
the control module is used for controlling the on and off of the current path according to the switch control signal; and
a switch detection module including a first communication path and a second communication path for providing the disabled switch control signal to turn off the current path via one of the first communication path and the second communication path that is turned on when the power source terminal is powered on, and
providing the switch control signal active to render the current path conductive when the other of the first communication path and the second communication path is conductive,
wherein the first communicating path and the second communicating path each include two portions to be communicated with each other, and when the first communicating path or the second communicating path is conducted, the corresponding two portions to be communicated are communicated with each other,
the switch detection module is used for generating an invalid switch control signal based on a communicated first to-be-communicated part on one of the conducted first communication path and the second communication path when the power supply end is powered on, and outputting the invalid switch control signal based on a communicated second to-be-communicated part on one of the conducted first communication path and the second communication path.
2. The power protection circuit of claim 1, wherein the relay further comprises a first control terminal and a second control terminal connected to the control module,
when the voltages of the first control terminal and the second control terminal are equal, the current path is conducted, an
When the voltages at the first control end and the second control end are not equal, the current path is turned off.
3. The power protection circuit of claim 2, wherein the control module comprises:
a diode having an anode connected to the second control terminal and a cathode connected to the first control terminal and a power supply voltage;
the switch tube is connected between the anode of the diode and the ground in series, and the control end of the switch tube is connected to the switch detection module to receive the switch control signal; and
a first resistor, the first end of which is connected to the control end of the switch tube, the second end of which is grounded,
wherein, when the switch control signal is invalid, the switch tube is disconnected, the voltage of the first control end is equal to that of the second control end,
when the switch control signal is effective, the switch tube is conducted, and the voltages of the first control end and the second control end are not equal.
4. The power protection circuit of claim 3, wherein the switch detection module comprises:
the charging unit is used for obtaining a charging voltage according to the power supply voltage;
a signal generating unit for generating the switch control signals which are valid and invalid according to the charging voltage; and
a switching unit for turning on the first communication path or the second communication path to output as the switching control signal.
5. The power protection circuit according to claim 4, wherein the charging unit includes a second resistor and a capacitor connected in series between the power supply voltage and ground, and an intermediate node of the second resistor and the capacitor outputs the charging voltage.
6. The power protection circuit according to claim 4, wherein the switching unit includes first to eighth pins,
the second pin is used for receiving the charging voltage,
the first pin and the third pin are respectively connected to the input terminals of the signal generating units to respectively supply the charging voltages to the signal generating units,
a fourth pin and a sixth pin are respectively connected to an output terminal of the signal generation unit to receive the switch control signal,
the fifth pin is connected to the control end of the switch tube,
the seventh pin and the eighth pin are grounded,
wherein, when the first communication path is conducted, the first pin is communicated with the second pin, the fifth pin is communicated with the sixth pin, and
when the second communicating path is conducted, the second pin is communicated with the third pin, and the fourth pin is communicated with the fifth pin.
7. The power protection circuit of claim 6, wherein the signal generating unit comprises a first NAND gate, a second NAND gate, a third resistor and a fourth resistor,
the first NAND gate comprises a first input terminal, a second input terminal and a first output terminal, the first input terminal is connected to the first pin, the first output terminal is connected to the sixth pin, the second input terminal is connected to the fourth pin,
the second NAND gate comprises a third input end, a fourth input end and a second output end, the third input end is connected to the first output end of the first NAND gate, the fourth input end is connected to the third pin, the second output end is connected to the fourth pin,
a first end of the third resistor is connected to the first input end of the first NAND gate, a second end of the third resistor is connected to the power supply voltage,
the first end of the fourth resistor is connected to the power supply voltage, and the second end of the fourth resistor is connected to the fourth input end of the second nand gate.
8. The power protection circuit according to claim 4, wherein the switching unit comprises a double pole double throw switch.
9. The power protection circuit of claim 3, wherein the switching transistor is a P-type metal oxide field effect transistor.
10. A test apparatus comprising the power protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910229080.0A CN109917162B (en) | 2019-03-25 | 2019-03-25 | Power supply protection circuit and testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910229080.0A CN109917162B (en) | 2019-03-25 | 2019-03-25 | Power supply protection circuit and testing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109917162A CN109917162A (en) | 2019-06-21 |
| CN109917162B true CN109917162B (en) | 2021-08-06 |
Family
ID=66966648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910229080.0A Active CN109917162B (en) | 2019-03-25 | 2019-03-25 | Power supply protection circuit and testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109917162B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114911664B (en) * | 2022-07-18 | 2022-09-30 | 上海泰矽微电子有限公司 | Multi-path power supply switching SOC test method and system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09284997A (en) * | 1996-04-16 | 1997-10-31 | Matsushita Seiko Co Ltd | Relay protection device |
| CN2753010Y (en) * | 2004-11-26 | 2006-01-18 | 周启华 | Power socket with overcurrent and short circuit protective device |
| CN101257211A (en) * | 2007-03-01 | 2008-09-03 | 海尔集团公司 | Circuit for preventing powered on moment impact in frequency converting air conditioner |
| CN201134755Y (en) * | 2007-11-20 | 2008-10-15 | 深圳和而泰智能控制股份有限公司 | Variable-frequency power supply circuit protecting device |
| CN102751709A (en) * | 2011-04-20 | 2012-10-24 | 鸿富锦精密工业（深圳）有限公司 | Protection circuit |
| CN203911743U (en) * | 2014-05-05 | 2014-10-29 | 邯郸美的制冷设备有限公司 | Electronic device and capacitor discharge circuit thereof |
| CN204696910U (en) * | 2015-02-28 | 2015-10-07 | 北京航天计量测试技术研究所 | A kind of circuit preventing power supply electrifying from directly loading |
| CN105988030A (en) * | 2015-01-31 | 2016-10-05 | 鸿富锦精密工业(武汉)有限公司 | Electronic equipment and over-current protection circuit thereof |
-
2019
- 2019-03-25 CN CN201910229080.0A patent/CN109917162B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09284997A (en) * | 1996-04-16 | 1997-10-31 | Matsushita Seiko Co Ltd | Relay protection device |
| CN2753010Y (en) * | 2004-11-26 | 2006-01-18 | 周启华 | Power socket with overcurrent and short circuit protective device |
| CN101257211A (en) * | 2007-03-01 | 2008-09-03 | 海尔集团公司 | Circuit for preventing powered on moment impact in frequency converting air conditioner |
| CN201134755Y (en) * | 2007-11-20 | 2008-10-15 | 深圳和而泰智能控制股份有限公司 | Variable-frequency power supply circuit protecting device |
| CN102751709A (en) * | 2011-04-20 | 2012-10-24 | 鸿富锦精密工业（深圳）有限公司 | Protection circuit |
| CN203911743U (en) * | 2014-05-05 | 2014-10-29 | 邯郸美的制冷设备有限公司 | Electronic device and capacitor discharge circuit thereof |
| CN105988030A (en) * | 2015-01-31 | 2016-10-05 | 鸿富锦精密工业(武汉)有限公司 | Electronic equipment and over-current protection circuit thereof |
| CN204696910U (en) * | 2015-02-28 | 2015-10-07 | 北京航天计量测试技术研究所 | A kind of circuit preventing power supply electrifying from directly loading |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109917162A (en) | 2019-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5440254A (en) | Accurate low voltage detect circuit | |
| TWI416836B (en) | Esd protection circuit | |
| CN102377416A (en) | Power supply resetting circuit | |
| CN113328734A (en) | Fast blocking switch | |
| TW201937331A (en) | Voltage regulation system, voltage regulation chip and voltage regulation control method thereof | |
| CN109917162B (en) | Power supply protection circuit and testing device | |
| CN207516929U (en) | Switching on and shutting down control circuit and mobile terminal | |
| CN102315633B (en) | Electrostatic protection circuit | |
| EP1034619A1 (en) | Zero power power-on-reset circuit | |
| CN117559979A (en) | Power-on reset circuit | |
| US20090051407A1 (en) | Switch circuit | |
| CN111224648B (en) | Power-on and power-off reset control circuit without static power consumption | |
| CN108572690B (en) | Current mirror circuit | |
| CN114696816A (en) | Interface circuit | |
| CN111796976B (en) | Detection circuit of USB interface and port detection device | |
| CN101363878A (en) | Circuit for detecting power supply voltage drop | |
| CN112015114B (en) | Automatic control circuit for time sequence of multi-path power supply | |
| CN115241839A (en) | Overcurrent protection circuit, overcurrent protection method and display device | |
| CN113890520A (en) | Reset circuit | |
| CN110134174B (en) | Power supply starting reset circuit with magnetic hysteresis function | |
| CN108768356B (en) | Power-on self-locking control circuit and power supply | |
| JP2012059815A (en) | Semiconductor device | |
| JP2014116925A (en) | Power-on reset circuit | |
| US8450987B2 (en) | Switching apparatus and control signal generator thereof | |
| CN216794968U (en) | Reset circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |