CN210111849U - Stable and reliable MCCB (micro-circuit board) self-generating power supply capable of quickly reacting - Google Patents
Stable and reliable MCCB (micro-circuit board) self-generating power supply capable of quickly reacting Download PDFInfo
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- CN210111849U CN210111849U CN201921304347.XU CN201921304347U CN210111849U CN 210111849 U CN210111849 U CN 210111849U CN 201921304347 U CN201921304347 U CN 201921304347U CN 210111849 U CN210111849 U CN 210111849U
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Abstract
The utility model discloses a reliable and stable fast reaction MCCB is from giving birth to power, it includes voltage comparator U2, be used for outputting reference voltage's the first voltage stabilization input of the same kind, second way voltage stabilization input and MOS pipe that are used for acquireing voltage in real time, wherein the first way voltage stabilization input connects voltage comparator U2's negative terminal, and second way voltage stabilization input connects voltage comparator U2's positive terminal, just power comparator U2's output is connected with the control end of MOS pipe, voltage comparator U2 exports the low level when positive terminal voltage is below the negative terminal voltage, and the MOS pipe does not switch on, voltage comparator U2's positive terminal voltage exports the high level when being higher than negative terminal voltage, and the MOS pipe leads to with power and ground intercommunication, can reach quick protection, improve the reliability. The voltage comparator can save cost. The circuit also inhibits high-frequency interference, reduces ripples, and improves product quality.
Description
Technical Field
The utility model relates to a low-voltage apparatus field, concretely relates to reliable and stable fast reaction MCCB autogenous power supply.
Background
According to GB/T22710-. The accuracy and reliability of the self-generated power supply design is critical to ensure reliable operation of the circuit breaker controller.
The autogenous power supply of the molded case circuit breaker in the industry at present generally adopts a power supply monitoring chip to monitor the divided power supply voltage, when the divided power supply voltage exceeds a set value, the monitoring chip outputs a high level to drive an MOS (metal oxide semiconductor) tube to be conducted to conduct a current source to the ground, and the rear-stage voltage is protected from being too high.
Through laboratory test, the existing circuit has great high-frequency interference, and is extremely unfavorable for the stability and the reliability of the controller. In addition, the existing circuit has relatively slow response to power protection, and has hidden trouble that the circuit cannot be protected in time under the condition of large current impact.
SUMMERY OF THE UTILITY MODEL
To the problem, the utility model provides a reliable and stable fast reaction MCCB autogenous power supply.
In order to achieve the above object, the utility model provides a reliable and stable fast reaction MCCB autogenous power supply, it includes voltage comparator U2, is used for outputting reference voltage's the first voltage stabilization input of the way, is used for acquireing second way voltage stabilization input and the MOS pipe of voltage in real time, wherein the first way voltage stabilization input connects voltage comparator U2's negative terminal, and second way voltage stabilization input connects voltage comparator U2's positive terminal, just power comparator U2's output is connected with the control end of MOS pipe, voltage comparator U2 exports the low level when positive terminal voltage is below the negative terminal voltage, and the MOS pipe does not switch on, output high level when voltage is higher than negative terminal voltage to voltage comparator U2's positive terminal voltage, and the MOS pipe is led to communicate power VCC with ground.
The first path of voltage-stabilizing input comprises a voltage-stabilizing tube D3, the cathode of the voltage-stabilizing tube is connected with the nodes of a resistor R5 and a resistor R3 which are connected IN series, the other end of the resistor R3 is connected with the negative end of a voltage comparator U2, the other end of the resistor R5 is connected with an input power VCC _ IN, and the anode of the voltage-stabilizing tube D3 is grounded.
The second path of voltage-stabilizing input comprises a voltage-stabilizing tube D15, the cathode of the voltage-stabilizing tube D15 is connected with an input power supply VCC _ IN, the anode of the voltage-stabilizing tube D15 is connected with the nodes of a resistor R51 and a resistor R32 which are connected IN series, the other end of the resistor R51 is grounded, and the other end of the resistor R32 is connected with the positive end of a voltage comparator U2.
And a capacitor C2 is connected in parallel to two ends of the resistor R51.
A resistor R11 is connected in parallel between the output end and the positive end of the power supply comparator U2.
The output end of the power supply comparator U2 is provided with a hysteresis circuit.
The hysteresis circuit comprises a voltage regulator tube D2, the cathode of the voltage regulator tube D2 is connected with an input power supply VCC _ IN, and the anode of the voltage regulator tube D2 is connected with a resistor R31 IN series and then is connected with the output end of a voltage comparator U2.
And two ends of the voltage regulator tube D2 are respectively grounded through capacitors.
The control end of the MOS transistor Q1 is connected with the output end of the voltage comparator U2 through a resistor R7, and the control end of the MOS transistor Q1 is grounded through a resistor R39.
And a diode D4 is arranged between the power supply VCC and the power supply VCC _ IN.
The utility model has the advantages that: the method can achieve rapid protection and improve reliability. The voltage comparator can save cost. The circuit also inhibits high-frequency interference, reduces ripples, and improves product quality.
The electronic control unit of the molded case circuit breaker has universality in the aspects of power supply and protection processing through the induced current of the secondary side of the mutual inductor, and the circuit scheme of the voltage comparator has the effects of saving cost, optimizing protection performance and improving product reliability, and is very suitable for the power supply unit of the electronic control unit of the molded case circuit breaker.
Drawings
Fig. 1 is a schematic circuit diagram 1 of the present invention.
Fig. 2 is a schematic circuit diagram 2 of the present invention.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in the figure, the utility model provides a reliable and stable fast reaction MCCB autogenous power supply, it includes voltage comparator U2, is used for outputting reference voltage's the first steady voltage input of the way, is used for acquireing second way steady voltage input and the MOS pipe of voltage in real time, and wherein the first way steady voltage input of voltage comparator U2's negative terminal, second way steady voltage input connect voltage comparator U2's positive terminal, just power comparator U2's output is connected with the control end of MOS pipe, voltage comparator U2 exports the low level when positive terminal voltage is lower than the negative terminal voltage, and the MOS pipe does not switch on, output high level when voltage of voltage comparator U2 is higher than negative terminal voltage, and the MOS pipe is led to communicate power VCC and ground.
The first path of voltage-stabilizing input comprises a voltage-stabilizing tube D3, the cathode of the voltage-stabilizing tube is connected with the nodes of a resistor R5 and a resistor R3 which are connected IN series, the other end of the resistor R3 is connected with the negative end of a voltage comparator U2, the other end of the resistor R5 is connected with an input power VCC _ IN, and the anode of the voltage-stabilizing tube D3 is grounded.
The second path of voltage-stabilizing input comprises a voltage-stabilizing tube D15, the cathode of the voltage-stabilizing tube D15 is connected with an input power supply VCC _ IN, the anode of the voltage-stabilizing tube D15 is connected with the nodes of a resistor R51 and a resistor R32 which are connected IN series, the other end of the resistor R51 is grounded, and the other end of the resistor R32 is connected with the positive end of a voltage comparator U2. The voltage regulator tube D15 is a 10V voltage regulator tube.
The first path of the controller power supply is subjected to current limiting through a resistor R5 and then flows through a voltage regulator tube D3 to generate a stable reference voltage which is connected to the negative end of a voltage comparator U2, the other path of the controller power supply is connected to the positive end of the voltage comparator U2 after being subjected to voltage division through a 10V voltage regulator tube, when the voltage is lower, the reference voltage input by the first path of voltage regulator is higher than the voltage input by the second path of voltage regulator tube (the voltage regulator tube is not connected), the output of the voltage comparator is low level, an MOS tube is not connected, the power supply voltage is not controlled, and the power supply voltage. When the power supply voltage continuously rises to a set value, the positive terminal voltage of the second path of voltage stabilization input exceeds the negative terminal reference voltage, the voltage comparator outputs high level to drive the MOS tube to be conducted, the input current is conducted to the ground, and the power supply is protected.
And a capacitor C2 is connected in parallel to two ends of the resistor R51.
A resistor R11 is connected in parallel between the output end and the positive end of the power supply comparator U2.
The output end of the power supply comparator U2 is provided with a hysteresis circuit. The hysteresis circuit comprises a voltage regulator tube D2, the cathode of the voltage regulator tube D2 is connected with an input power supply VCC _ IN, and the anode of the voltage regulator tube D2 is connected with a resistor R31 IN series and then is connected with the output end of a voltage comparator U2. The circuit is also provided with a hysteresis circuit to prevent the MOS tube from being frequently switched on and off near the set point, and the power supply voltage is divided by a small voltage-stabilizing tube D2 and then supplies power to the MOS tube driving circuit, so that the MOS tube can not be driven when the power supply voltage is small, and the driving voltage of the MOS tube is in a reasonable range when the power supply voltage is normal.
And two ends of the voltage regulator tube D2 are respectively grounded through capacitors.
The control end of the MOS transistor Q1 is connected with the output end of the voltage comparator U2 through a resistor R7, and the control end of the MOS transistor Q1 is grounded through a resistor R39.
Wherein MOS pipe Q1 'S D end series inductance L1 back connection power VCC, and MOS pipe Q1' S S end then direct ground connection, through switching on of control end control MOS pipe, directly make power VCC direct and ground intercommunication, and series connection diode D4 between power VCC and power VCC _ IN, prevent that power VCC _ IN from being grounded, and can guarantee simultaneously when power VCC _ IN is lower, can utilize power VCC to charge it.
The power supply protection circuit is realized by using a voltage comparator scheme, the output response time of the voltage comparator is 1.3us which is far less than about 120us of a voltage monitoring chip, so that the effect of quickly tracking and responding the change of a power supply at the input side so as to drive the MOS tube protection circuit can be realized
The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of the present invention.
Claims (10)
1. A stable and reliable fast reaction MCCB self-generating power supply is characterized in that: the voltage comparator U2 is used for outputting a first path of voltage-stabilizing input of reference voltage, a second path of voltage-stabilizing input used for acquiring voltage in real time and an MOS (metal oxide semiconductor) tube, wherein the first path of voltage-stabilizing input is connected with the negative end of the voltage comparator U2, the second path of voltage-stabilizing input is connected with the positive end of the voltage comparator U2, the output end of the voltage comparator U2 is connected with the control end of the MOS tube, the voltage comparator U2 outputs low level when the positive end voltage is lower than the negative end voltage, the MOS tube is not conducted, the positive end voltage of the voltage comparator U2 outputs high level when the positive end voltage is higher than the negative end voltage, the MOS tube is conducted, and a power supply VCC is communicated with the ground.
2. A stable, reliable and fast reacting MCCB self-generated power supply as claimed in claim 1, wherein: the first path of voltage-stabilizing input comprises a voltage-stabilizing tube D3, the cathode of the voltage-stabilizing tube is connected with the nodes of a resistor R5 and a resistor R3 which are connected IN series, the other end of the resistor R3 is connected with the negative end of a voltage comparator U2, the other end of the resistor R5 is connected with an input power VCC _ IN, and the anode of the voltage-stabilizing tube D3 is grounded.
3. A stable, reliable and fast reacting MCCB self-generated power supply as claimed in claim 1, wherein: the second path of voltage-stabilizing input comprises a voltage-stabilizing tube D15, the cathode of the voltage-stabilizing tube D15 is connected with an input power supply VCC _ IN, the anode of the voltage-stabilizing tube D15 is connected with the nodes of a resistor R51 and a resistor R32 which are connected IN series, the other end of the resistor R51 is grounded, and the other end of the resistor R32 is connected with the positive end of a voltage comparator U2.
4. A stable, reliable and fast reacting MCCB self-generated power supply according to claim 3, wherein: and a capacitor C2 is connected in parallel to two ends of the resistor R51.
5. A stable, reliable and fast reacting MCCB self-generated power supply as claimed in claim 1, wherein: a resistor R11 is connected in parallel between the output end and the positive end of the voltage comparator U2.
6. A stable, reliable and fast reacting MCCB self-generated power supply as claimed in claim 1, wherein: the output end of the voltage comparator U2 is provided with a hysteresis circuit.
7. A stable, reliable and fast reacting MCCB self-generated power supply according to claim 6, wherein: the hysteresis circuit comprises a voltage regulator tube D2, the cathode of the voltage regulator tube D2 is connected with an input power supply VCC _ IN, and the anode of the voltage regulator tube D2 is connected with a resistor R31 IN series and then is connected with the output end of a voltage comparator U2.
8. A stable, reliable and fast reacting MCCB self-generated power supply according to claim 7, wherein: and two ends of the voltage regulator tube D2 are respectively grounded through capacitors.
9. A stable, reliable and fast reacting MCCB self-generated power supply as claimed in claim 1, wherein: the control end of the MOS transistor Q1 is connected with the output end of the voltage comparator U2 through a resistor R7, and the control end of the MOS transistor Q1 is grounded through a resistor R39.
10. A stable, reliable and fast reacting MCCB self-generated power supply as claimed in claim 1, wherein: and a diode D4 is arranged between the power supply VCC and the power supply VCC _ IN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921304347.XU CN210111849U (en) | 2019-08-13 | 2019-08-13 | Stable and reliable MCCB (micro-circuit board) self-generating power supply capable of quickly reacting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921304347.XU CN210111849U (en) | 2019-08-13 | 2019-08-13 | Stable and reliable MCCB (micro-circuit board) self-generating power supply capable of quickly reacting |
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| Publication Number | Publication Date |
|---|---|
| CN210111849U true CN210111849U (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921304347.XU Active CN210111849U (en) | 2019-08-13 | 2019-08-13 | Stable and reliable MCCB (micro-circuit board) self-generating power supply capable of quickly reacting |
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| Country | Link |
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| CN (1) | CN210111849U (en) |
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2019
- 2019-08-13 CN CN201921304347.XU patent/CN210111849U/en active Active
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