CN210350849U - Security protection power supply is equipped with electric circuit and power panel - Google Patents
Security protection power supply is equipped with electric circuit and power panel Download PDFInfo
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- CN210350849U CN210350849U CN201920723708.8U CN201920723708U CN210350849U CN 210350849 U CN210350849 U CN 210350849U CN 201920723708 U CN201920723708 U CN 201920723708U CN 210350849 U CN210350849 U CN 210350849U
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Abstract
The utility model relates to a security protection power technical field especially relates to a security protection power is equipped with electric circuit and power disc, can be based on the basis that is connected to the battery of output and is equipped with the basis of electric power supply branch road, utilize the output voltage of this output of comparison circuit real-time supervision, and when detecting this output voltage and be less than the predetermined threshold value, trigger the trouble hiccup protection circuit and open the switching device in the battery is equipped with electric power supply branch road, in order to utilize this battery to be equipped with electric power supply branch road to supply power to the output, and then realize that the circuit is simple, with low costs and independent output's security protection power is equipped with electric circuit.
Description
Technical Field
The utility model relates to a security protection power technical field especially relates to a security protection power is equipped with electric circuit and power disc.
Background
Based on the requirement of high-reliability work, a general security protection power supply is provided with a standby power system so as to maintain the normal work of the security protection system when the alternating current input is abnormal (such as power failure and line fault).
The existing security protection power supply standby circuit generally adopts battery standby and multipath independent direct current output to ensure the normal operation of the whole security protection system. For example, a BUCK-BOOST circuit can be used to construct a backup power module, but the current backup power module generally needs an independent isolation circuit, which leads to a complex circuit and high cost, and cannot protect independent outputs of each branch circuit.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to provide a security protection power supply standby circuit with simple circuit, low cost and independent output, on the basis of the battery standby power supply branch circuit connected to the output end, the output voltage of the output end is monitored in real time by using the comparison circuit, and when the output voltage is detected to be lower than the preset threshold value, the fault hiccup protection circuit is triggered to turn on the switch device in the battery standby power supply branch circuit, so as to supply power to the output end by using the battery standby power supply branch circuit.
The embodiment of the application provides a security protection power supply circuit of being equipped with electricity, can be applied to and utilize the security protection power to pass through the system of power output end to security protection equipment power supply, the security protection power supply circuit of being equipped with electricity includes:
the standby power branch comprises a standby power supply and a switching device, and the standby power supply can be connected with the power supply output end in series through the switching device;
the output voltage detection branch is electrically connected with the power supply output end; and
comparing the branch with a fault hiccup protection branch;
wherein the control terminal of the switching device is electrically connected to the output terminal of the comparison branch circuit through the fault hiccup circuit, and the input terminal of the comparator branch circuit is electrically connected to the output terminal of the output voltage detection module.
In an alternative embodiment, the comparison branch comprises a comparator U1 having a first input; the output voltage detection branch comprises a resistor R1, a resistor R2 and a capacitor C1;
the power supply output end is grounded through the resistor R1 and the resistor R2 in sequence, and the capacitor C1 is connected in parallel to two ends of the resistor R1; and
the first input of the comparator U1 is electrically connected to a branch between the resistor R1 and the resistor R2.
In an alternative embodiment, the comparator U1 also has a second input; the security protection power supply standby circuit further comprises a driving power supply VDR, a resistor R3, a resistor R4 and a capacitor C2;
the driving power supply VDR is electrically connected with the control end of the switching device, and is grounded through the resistor R3 and the resistor R4 in sequence; the second input terminal of the comparator U1 is grounded via the capacitor C2, and the second input terminal of the comparator U1 is further connected to a branch between the resistor R3 and the resistor R4.
In an alternative embodiment, the switching device comprises a fet Q1 and a fet Q2 connected in parallel;
the driving power supply VDR is respectively and electrically connected with the control ends of the field effect transistor Q1 and the field effect transistor Q2.
In an optional embodiment, the security power supply standby circuit further includes a preset voltage power supply VCC and a preset resistor R5;
the preset voltage source VCC is electrically connected to the power input terminal of the comparator U1, and is also electrically connected to the first input terminal of the comparator U1 through the preset resistor R5.
In an optional embodiment, the security power supply standby circuit further comprises a capacitor C3 and a capacitor C4;
the output end of the standby power supply is grounded through the capacitor C3; the power supply output terminal is grounded through the capacitor C4.
In an optional embodiment, the security power supply backup circuit further comprises a voltage dependent resistor MOV 1;
wherein, the piezoresistor MOV1 is connected in parallel with two ends of the capacitor C4.
In an optional embodiment, the backup power branch further comprises a current detection resistor RS1 in series with the backup power supply and the switching device; security protection power supply is equipped with electric circuit still includes:
the current detection delay protection branch circuit is provided with two detection input ends and one detection output end;
wherein the two detection input ends are respectively and electrically connected to two ends of the current detection resistor RS1, and the detection output end is electrically connected to the input end of the fault hiccup protection circuit.
In an alternative embodiment, the backup power source includes a battery.
In an optional embodiment, the security protection power supply backup circuit may further include a battery power supply branch and a DC/DC power supply branch which are connected in parallel;
the battery power supply branch circuit is the 24V storage battery power supply circuit.
In an optional embodiment, an embodiment of the present application further provides a power panel, which may be used to supply power to a security device, where the power panel includes:
the security protection power supply supplies power to the security protection equipment through the power output end; and
the security protection power supply standby circuit according to any one of the embodiments of the application;
when the power supply of the main power supply branch is abnormal, the security protection power supply standby circuit supplies power to the security protection equipment through the power output end.
Drawings
FIG. 1 is a schematic diagram of a security power supply backup circuit in an alternative embodiment;
FIG. 2 is a schematic diagram of the structure of a power panel in an alternative embodiment;
FIG. 3 is a schematic diagram of a response waveform of a power backup circuit of a security power supply in an embodiment of the present application;
fig. 4 is a schematic diagram of response speed of a security power supply standby circuit in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic diagram of a security power supply standby circuit in an alternative embodiment. As shown in fig. 1, a security protection power supply backup circuit may be applied to a system that supplies power to a security protection device (not shown in the figure) by using a security protection power supply (not shown in the figure) through a power output terminal Vout in a multi-path direct current output manner, where the security protection power supply backup circuit may include a backup branch 11, an output voltage detection branch 12, a comparison branch 13, a fault hiccup protection branch 14, and the like; the standby branch 11 can utilize a storage battery and/or other direct-current power supplies to supply power to a plurality of security devices through the power output terminal Vout in a multi-path direct-current output manner, so as to ensure that each security device can normally work when the security power supply is abnormal (for example, power failure, undervoltage and the like).
Specifically, as shown in fig. 1, the backup power branch 11 may include a backup power source (e.g., a 24V battery power supply branch and a DC/DC power supply branch connected in parallel), a switching device (e.g., a field effect transistor Q1 and a field effect transistor Q2 connected in parallel as a control output), a current detection resistor RS1, a power output terminal Vout, and the like, that is, each backup power source may pass through a diode D1 and then sequentially pass through a current detection resistor RS1, a field effect transistor Q1 and a field effect transistor Q2 connected in parallel to the power output terminal Vout; the output voltage detection branch 12 can be used for monitoring an electrical signal of a multi-path direct current output connected to the power output terminal Vout in real time, and the comparison circuit 13 compares the electrical signal monitored by the output voltage detection branch 12 with a preset electrical signal and outputs a comparison result to the fault hiccup protection branch 14; the hiccup protection branch 14 is connected to the control terminals of the fets Q1 and Q2, respectively, to control the operating state (e.g., on or off, etc.) of each fet based on the comparison. Wherein, the current detection resistor RS1 can be used for outputting overcurrent protection,
in an alternative embodiment, as shown in fig. 1, a current detection delay protection line may be connected in parallel to two ends of the current detection resistor RS1 in the standby power branch 11, so as to determine whether the standby power branch 11 operates normally by applying a current signal to the standby power branch 11, and when an abnormality of the standby power branch 11 is detected, the hiccup protection branch 14 is triggered to control the fet Q1 and the fet Q2 to be in an off state, so as to implement a self-protection function of the standby power branch 11.
The following describes in detail the specific circuit structure of the security power supply standby circuit with reference to the accompanying drawings:
as shown in fig. 1, the 24v battery power supply and the DC/DC power supply are both connected in parallel to the output node a of the backup power supply through a diode D1, one end of a current detection resistor RS1 is electrically connected to the output node a of the backup power supply, and the other end of the current detection resistor RS1 is electrically connected to the pin 2 of the fet Q1 and the pin 2 of the fet Q2, respectively; meanwhile, pin 3 of the field effect transistor Q1 and pin 3 of the field effect transistor Q2 are both electrically connected with the power output terminal Vout. In addition, the backup power supply output node a is connected to the ground terminal SVND through the capacitor C3, and the power supply output terminal Vout is electrically connected to the ground terminal SVND through the capacitor C4 and the varistor MOV1, respectively.
In an alternative embodiment, as shown in fig. 1, two input terminals of the current detection delay protection branch 15 are electrically connected to two ends of the current detection resistor RS1, respectively, a first input terminal of the fault protection circuit protection branch 14 is electrically connected to an output terminal of the current detection delay protection branch 15, an output terminal of the protection circuit protection branch 14, a pin 1 (i.e., a control terminal) of the fet Q1, and a pin 1 of the fet Q2 are electrically connected to the node B, respectively, and a second input terminal of the protection circuit protection branch 14 is electrically connected to an output pin 1 of the comparator U1. The input pin 2 of the comparator U1 is connected to a node C, the node C is connected to a ground terminal SVND through a parallel capacitor C2 and a resistor R4, the input pin 3 of the comparator U1 is electrically connected to a preset voltage source VCC through a resistor R5, the input pin 3 of the comparator U1 is also connected to a node D, the node D is connected to the ground terminal SVND through a resistor R2, and the node D is also connected to the power output terminal Vout through a parallel resistor R1 and a parallel capacitor C1. Meanwhile, the preset voltage VCC is also electrically connected to the power pin 8 of the comparator U1, and the ground pin 4 of the comparator U1 is connected to the ground terminal SVND. In addition, the node B is also connected to a driving power supply VDR, which is also connected to the node C through a resistor R3.
In an alternative embodiment, as shown in fig. 1, the current detection delay protection branch 15 may be configured to perform amplification delay (i.e. when a capacitive load is loaded, there is a large current charging process on the capacitive load) processing by detecting a voltage generated by a current flowing through the RS1, and when a current greater than or equal to a set overcurrent protection point is detected, the current detection delay protection branch 15 starts a delay action and sends a trigger signal to the fault hiccup protection branch 14, so as to turn off the output of the driving power supply VDR to the fet Q1 and fet Q2.
In another alternative embodiment, as shown in fig. 1, the hiccup protection branch 14 can be used to quickly turn off the output of the driving power supply VDR to the fet Q1 and fet Q2 when receiving a trigger signal (e.g., the trigger signal output by the comparator U1 and/or the current detection delay protection branch 15, i.e., the fault signal), and after maintaining the off state for a predetermined period of time, release the driving power supply VDR for the next detection, and by resetting again for the next cycle at intervals, can help to reduce the power consumption of the continuous overcurrent or short-circuit protection, thereby ensuring the damage of the continuous overcurrent or short-circuit protection to the circuit elements.
Referring to fig. 1, in an alternative embodiment of the security protection power supply backup circuit, the resistor R1, the resistor R2, and the capacitor C1 may form an output voltage detection circuit for monitoring a voltage signal at the power output terminal Vout in real time, and the resistor R5 may be used as a pre-bias resistor for providing a bias voltage to the comparator U1 based on the pre-voltage power VCC, so as to prevent the comparator U1 from malfunctioning when the power output terminal Vout is not outputting (i.e., the voltage is zero), which causes the hiccup fault branch 14 to turn off the driving power supply VDR of the fet Q1 and the fet Q2, thereby causing the output of the security protection power supply backup circuit to be turned off. The resistor R3, the resistor R4, and the capacitor C2 form a driving detection circuit, i.e., a threshold voltage generated on the resistor R4 by the driving power supply VDR can be used to make the comparator U1 compare the voltage signal detected by the output voltage detection circuit based on the threshold voltage, and further determine whether the voltage at the current power supply output terminal Vout is normal. The resistors R1 and R2 in the output voltage detection circuit can divide the output voltage (i.e., the voltage at the power output terminal Vout) and provide the divided voltage to the first input pin 3 of the comparator U1. The capacitor C1 can be used as an accelerating capacitor to accelerate a voltage supplied to the first input pin 3 during the voltage rising process to prevent the malfunction of the power-on; meanwhile, when short-circuit protection is performed, due to the fact that the output voltage drops rapidly, the capacitor C1 can also rapidly pull down the voltage of the first input pin 3 of the comparator U1, and when the voltage on the first input pin 3 is lower than the voltage on the second input pin 2 of the comparator U1, the comparator U1 is triggered to act, so that the driving power supply VDR of the control ends of the field effect transistor Q1 and the field effect transistor Q2 is rapidly turned off through a fault hiccup branch, and output is turned off.
Referring to fig. 1, in another alternative embodiment of the security power supply backup circuit, the resistor R3 and the resistor R4 in the driving detection branch may divide the voltage of the driving power supply VDR and provide the divided voltage to the second input pin 2 of the comparator U1 as the voltage of the second input pin 2, and the capacitor C2 may be a delay capacitor, which may be used to make the voltage of the second input pin 2 of the comparator U1 closely follow the voltage of the first input pin 3 of the comparator U1, so as to prevent malfunction of the comparator U1. Simultaneously, because after closing field effect transistor Q1 and field effect transistor Q2's drive voltage VDR, resistance R3 and resistance R4 in this drive detection branch road drop to 0v to drive power supply VDR's voltage, so make security protection power supply backup circuit in the embodiment of this application can reset and detect next time to can effectively avoid thoroughly closing the output because of appearing locking the trouble.
In an optional embodiment, an embodiment of the present application further provides a power panel, which may be used to supply power to a security device, where the power panel may include a main power supply branch and the security power supply backup circuit as described in any embodiment of the present application, the main power supply branch may include a security power supply and a power output end, and the security power supply may supply power to the security device through the power output end; when the power supply of the main power supply branch is abnormal, the security protection power supply standby circuit in the embodiment of the application can supply power to the security protection equipment through the power supply output end, so that the security protection equipment can continuously and normally work.
Fig. 2 is a schematic structural diagram of a power panel in an alternative embodiment. As shown in fig. 2, a 24v DC power supply (i.e., DC24v) in the power panel supplies power to the AC-DC module through a power backup management system (i.e., a security power backup circuit), and the power backup management system is also connected to an MCU (i.e., a microprocessor) module, and the MCU module is electrically connected to the buzzer and the display operation device, respectively; 220v alternating current power supply (namely AC220v) supplies power to each output branch circuit through the AC-DC module, so that the security equipment electrically connected with each output branch circuit works normally; each output branch circuit comprises a protection circuit, a lightning protection filter circuit, an output port and the like which are sequentially connected in series.
The following describes an example of a power panel in the embodiment of the present application with reference to an actual product:
aiming at a main power supply with a lightning protection and filtering function, two lead-acid storage batteries connected in series are connected in parallel to serve as a power panel of a standby power supply, the main power supply is a 220V/50Hz alternating current power supply, the voltage range is 187V-242V, the frequency range is 47 Hz-63 Hz, the capacity range of the lead-acid storage batteries is 24 Ah-72 Ah, the voltage is 12V, and the standby power under-voltage value range is 21.3V +/-0.3V. Based on the security protection power supply standby circuit in the embodiment of the application, when the main power is available, the range of each output direct current voltage is 27 v-28 v, and when the main power is unavailable, the standby voltage can be followed, in addition, each output can also realize overcurrent protection and lightning protection filtering, each overcurrent protection point is about 10A, automatic recovery can be realized, and meanwhile, different output branches are not influenced by each other when short circuits occur.
In the embodiment, the power panel can realize fast under-voltage protection during short-circuit output, and the under-voltage protection point (i.e. the under-voltage protection value of the fast under-voltage protection circuit)) must be smaller than the standby under-voltage value, and satisfy the capacitive load capability during startup. Meanwhile, other single-chip microcomputers can be arranged to protect the standby power under-voltage.
Referring to fig. 1, the following calculation can be performed for the preset resistor R1 of 330k Ω, the preset resistor R2 of 51k Ω, the preset resistor R3 of 1M Ω, the preset resistor R4 of 75k Ω, and the preset resistor R5 of 1M Ω, the capacitor C1 of 101 (i.e., 100pF), and the capacitor C2 of 103 (i.e., 0.01 μ F):
the preset voltage at the first input pin 3 of the comparator U1 can be calculated:
calculating the voltage of the mains supply input at the first input pin 3 of the comparator U1 when the mains supply input works normally:
the voltage of the second input pin 2 of the comparator U1 during operation is calculated as:
calculating the voltage of a static undervoltage protection point of the rapid undervoltage protection circuit:
thus when the output voltage is less than 14.8V, detecting an under-voltage output voltage, the comparator U1 can quickly signal a fault and shut down the output by a fault hiccup protection circuit shutting down the drive voltage.
Meanwhile, due to the existence of the accelerating capacitor C1, the output voltage is actually larger than the voltage during short circuit. Meanwhile, the capacitance value of the capacitor C2 is related to the capacitive load, so that the requirement of the maximum capacitive load can be met.
Wherein, V in the above formulaU1-3SIndicating the preset voltage, V, at the first input pin 3 of the comparator U1U1-3Represents the voltage, V, of the comparator U1 at the first input pin 3 during normal operation of the mains inputCCRepresenting the supply voltage of the standby power supply of 12V \ dc, VOUTRepresenting the power supply output voltage, VOUT1And the voltage of the static undervoltage protection point of the rapid undervoltage protection circuit is represented.
Fig. 3 is a schematic diagram of a response waveform of a security power supply standby circuit in an embodiment of the present application, and fig. 4 is a schematic diagram of a response speed of the security power supply standby circuit in the embodiment of the present application. As shown in fig. 3, in practical applications, based on the security power supply standby circuit described in the embodiment of the present application, the voltage waveform p2 of the second input pin 2 of the comparator U1 can closely follow the voltage waveform p1 of the first input pin 3 of the comparator U1, that is, a short circuit occurs during the power-on process and/or before the power-on process. Referring to fig. 4, it can be seen that the voltage waveform p2 of the second input pin 2 of the comparator U1 begins to fall after 8.4 μ S after the output short circuit, i.e., the short circuit response time of the comparator U1 is 8.4 μ S.
To sum up, security protection power supply is equipped with electric circuit and power strip in this application embodiment, not only the simple with low costs of circuit, to the condition that direct current input is close with multichannel output voltage, can also be when one of them branch road is exported, can not exert an influence to other branch roads, and then realize the independent output of each branch road, and short circuit response is rapid.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides a security protection power supply circuit of being equipped with, is applied to and utilizes the security protection power to pass through the system of power output end to security protection equipment power supply, its characterized in that, the security protection power supply circuit of being equipped with includes:
the standby power branch comprises a standby power supply and a switching device, and the standby power supply can be connected with the power supply output end in series through the switching device;
the output voltage detection branch is electrically connected with the power supply output end; and
comparing the branch with a fault hiccup protection branch;
wherein the control terminal of the switching device is electrically connected to the output terminal of the comparison branch circuit through the fault hiccup circuit, and the input terminal of the comparator branch circuit is electrically connected to the output terminal of the output voltage detection module.
2. The security power supply backup circuit of claim 1, wherein the comparison branch comprises a comparator U1 having a first input; the output voltage detection branch comprises a resistor R1, a resistor R2 and a capacitor C1;
the power supply output end is grounded through the resistor R1 and the resistor R2 in sequence, and the capacitor C1 is connected in parallel to two ends of the resistor R1; and
the first input of the comparator U1 is electrically connected to a branch between the resistor R1 and the resistor R2.
3. The security power supply backup circuit of claim 2, wherein the comparator U1 further has a second input; the security protection power supply standby circuit further comprises a driving power supply VDR, a resistor R3, a resistor R4 and a capacitor C2;
the driving power supply VDR is electrically connected with the control end of the switching device, and is grounded through the resistor R3 and the resistor R4 in sequence; the second input terminal of the comparator U1 is grounded via the capacitor C2, and the second input terminal of the comparator U1 is further connected to a branch between the resistor R3 and the resistor R4.
4. The security power supply backup circuit of claim 3, wherein the switching device comprises a field effect transistor Q1 and a field effect transistor Q2 connected in parallel;
the driving power supply VDR is respectively and electrically connected with the control ends of the field effect transistor Q1 and the field effect transistor Q2.
5. The security power supply backup circuit of claim 2, further comprising a preset voltage source VCC and a preset resistor R5;
the preset voltage source VCC is electrically connected to the power input terminal of the comparator U1, and is also electrically connected to the first input terminal of the comparator U1 through the preset resistor R5.
6. The security power supply backup circuit of claim 1, further comprising a capacitor C3, a capacitor C4, and a varistor MOV 1;
the output end of the standby power supply is grounded through the capacitor C3; the power supply output end is grounded through the capacitor C4; the piezoresistor MOV1 is connected in parallel across the capacitor C4.
7. The security power supply backup circuit of claim 1, wherein the backup branch further comprises a current detection resistor RS1 in series with the backup power supply and the switching device; security protection power supply is equipped with electric circuit still includes:
the current detection delay protection branch circuit is provided with two detection input ends and one detection output end;
wherein the two detection input ends are respectively and electrically connected to two ends of the current detection resistor RS1, and the detection output end is electrically connected to the input end of the fault hiccup protection circuit.
8. The security protection power supply circuit of any one of claims 1-7, wherein the power supply comprises a battery.
9. The security protection power supply backup circuit of claim 8, further comprising a battery power supply branch and a DC/DC power supply branch connected in parallel;
the battery power supply branch is a 24V storage battery power supply branch.
10. A power panel for providing power to security equipment, the power panel comprising:
the security protection power supply supplies power to the security protection equipment through the power output end; and
the security protection power supply circuit of any one of claims 1-9;
when the power supply of the main power supply branch is abnormal, the security protection power supply standby circuit supplies power to the security protection equipment through the power output end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920723708.8U CN210350849U (en) | 2019-05-20 | 2019-05-20 | Security protection power supply is equipped with electric circuit and power panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920723708.8U CN210350849U (en) | 2019-05-20 | 2019-05-20 | Security protection power supply is equipped with electric circuit and power panel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116599204A (en) * | 2023-07-12 | 2023-08-15 | 新誉轨道交通科技有限公司 | Power supply device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116599204A (en) * | 2023-07-12 | 2023-08-15 | 新誉轨道交通科技有限公司 | Power supply device |
| CN116599204B (en) * | 2023-07-12 | 2023-09-29 | 新誉轨道交通科技有限公司 | power supply device |
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