Novel shunt release driving circuit
By introducing a power-on buffer circuit in the split-excitation tripper driving circuit, delayed conduction and delayed shutdown are achieved, and malfunctioning caused by lightning surges and coil burnout problems are solved, and the stability and reliability of the system are improved.
Patent Information
- Application Number
- CN202421483532.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The existing split-excitation tripper is prone to misoperation during lightning surges, resulting in the circuit breaker tripping by mistake and failing to meet the national standard requirements. At the same time, the coil may burn out for a long time.
A new type of split-excitation tripper driver circuit was designed, and a power supply power-on buffer circuit was introduced to achieve delayed conduction and delayed shutdown through RC charging delay, avoiding malfunction and preventing the coil from being powered for a long time.
It effectively avoids malfunction caused by lightning surges, extends the coil power-on time to avoid burnout, simplifies the structure of the excitation tripper, reduces manufacturing and maintenance costs, and improves the stability and reliability of the system.
Smart Images
Figure CN222826337U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electricity, in particular to a novel shunt release driving circuit. Background Art
[0002] The shunt release is an accessory for remotely controlling the opening of a circuit breaker. In the existing technology, the shunt release is usually used in series with a micro switch to avoid burning the coil due to long-term power supply. However, this method increases the complexity and cost of the entire system and reduces the reliability of the system.
[0003] At the same time, the current conventional shunt release is basically designed as an AC-DC flyback switching power supply solution. When the power supply voltage is equal to any voltage between 70% and 110% of the rated control power supply voltage, a 24V / 12V DC voltage can be output to the release coil to drive the release to trip the circuit breaker. However, according to the requirements of GB / T 17626.5, a 1KV line-to-line lightning surge test is performed on the shunt release. Although the conventional shunt release has added safety devices such as varistors to protect the subsequent circuits, the energy input at the moment of the surge is sufficient to establish the power output of the AC-DC, resulting in the shunt release malfunctioning and the molded case circuit breaker malfunctioning, which cannot meet the national standard requirements. Utility Model Content
[0004] In order to solve the above technical problems, the utility model proposes a novel shunt release driving circuit.
[0005] The purpose of the utility model is achieved through the following technical solutions:
[0006] A novel shunt release driving circuit comprises a first semiconductor switch device V1 and a second semiconductor switch device V2, wherein the source of the first semiconductor switch device V1 is electrically connected to one end of a tripping coil L1 of the shunt release, the drain of the second semiconductor switch device V2 is electrically connected to the other end of the tripping coil L1, one end of a seventh capacitor C7 and one end of an eleventh resistor R11 and is grounded, the other end of the seventh capacitor C7 is electrically connected to the other end of the eleventh resistor R11, one end of the seventh resistor R7 and the gate of the first semiconductor switch device V1, the other end of the seventh resistor R7 is electrically connected to the drain of the first semiconductor switch device V1, one end of a sixth resistor R6 and an output positive electrode of an AC-DC circuit; the source of the second semiconductor switch device V2 is electrically connected to one end of a sixth capacitor C6, one end of a tenth resistor R10 and an output negative electrode of the AC-DC circuit and is grounded; the other end of the sixth capacitor C6 is electrically connected to the other end of the tenth resistor R10, the other end of the sixth resistor R6 and the gate of the second semiconductor switch device V2.
[0007] As a further improvement, the first semiconductor switch device V1 and the second semiconductor switch device V2 are both MOS tubes.
[0008] As a further improvement, the first semiconductor switch device V1 is a PMOS tube, and the second semiconductor switch device V2 is an NMOS tube.
[0009] As a further improvement, the AC-DC circuit outputs a 12V or 24V direct current voltage.
[0010] The beneficial effects of the utility model are:
[0011] The utility model introduces a power-on buffer circuit to achieve that when a lightning surge occurs, the secondary output 24V / 12V power of the flyback switching power supply is established instantly, but it can only be normally output to drive the release after the patented delayed conduction of the utility model, effectively avoiding the malfunction caused by this. At the same time, because the coil power-on time generally cannot exceed 1S after the power output is turned on, otherwise the coil will be burned out. Now, the utility model is designed with a delayed shutdown, so that the power output is turned off within 1S to prevent the release from burning out; this design simplifies the structure of the shunt release, reduces the manufacturing and maintenance costs, and improves the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.
[0013] Figure 1 It is a schematic diagram of the existing shunt release driving circuit;
[0014] Figure 2 This is a schematic diagram of a shunt release driving circuit of the utility model. DETAILED DESCRIPTION
[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and examples.
[0016] Example 1
[0017] like Figure 1 This is the existing shunt release driving principle block diagram. When the power supply voltage is equal to any voltage between 70% and 110% of the rated control power supply voltage, the AC-DC power supply module can be used to step down and output DC 12V or 24V, which can directly drive the shunt release to operate. However, there will be problems such as lightning surge causing the release to malfunction and the release coil to burn out due to long-term power-on. To avoid these problems,
[0018] When the output power supply (i.e., the AC-DC circuit) 12V_DC is output normally, the MOS tubes V1 and V2 are both in the off state, and the current first passes through the resistor R6 to perform RC charging delay on the capacitor C6. When the gate-source voltage VGS of the NMOS tube V2 (i.e., the voltage across the tenth resistor R10) is higher than the threshold voltage of the NMOS tube, the NMOS tube V2 starts to conduct. As the NMOS tube V2 is conducted, the gate-source voltage of the PMOS tube V1 (i.e., the voltage across the seventh resistor R7) must be lower than the threshold voltage, causing the PMOS tube V1 to be conducted as well, and the release coil starts to pass current and voltage, and the release acts instantly to cause the circuit breaker to remotely trip for protection.
[0019] After the circuit breaker completes the remote tripping protection, the gate-source voltage VGS of the NMOS tube V2 (i.e., the voltage across the tenth resistor R10) is still higher than the threshold voltage of the NMOS tube, so the NMOS tube V2 is still in the on state, and the output current will continue to charge the capacitor C7 through the resistor R7, until the gate-source voltage VGS of the PMOS tube V1 (i.e., the voltage across the seventh resistor R7) is higher than the threshold voltage of the PMOS tube, the PMOS tube V1 starts to shut down, and one end of the tripping coil L1 no longer has an output. At this time, the voltage and current loop of the tripping coil is cut off, avoiding the possibility of the coil being powered for a long time, thereby burning out the tripping coil;
[0020] The delayed on time and the delayed off time in the circuit of the utility model can adjust the values of the resistor R and the capacitor C according to the actual application requirements. The specific calculation formula of the delay time t of the RC charging circuit is:
[0021]
[0022] Wherein V1 is the power supply voltage, V0 is the capacitor voltage at the initial moment, Vt is the capacitor voltage at moment t, and R and C are the resistor and capacitor in the utility model respectively.
[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.
Claims
1. A novel shunt release driving circuit, characterized in that: The invention comprises a first semiconductor switch device (V1) and a second semiconductor switch device (V2), wherein the source of the first semiconductor switch device (V1) is electrically connected to one end of a tripping coil (L1) of a shunt releaser, the drain of the second semiconductor switch device (V2) is electrically connected to the other end of the tripping coil (L1), one end of a seventh capacitor (C7) and one end of an eleventh resistor (R11) and is grounded, and the other end of the seventh capacitor (C7) is electrically connected to the other end of the eleventh resistor (R11), one end of the seventh resistor (R7) and the first semiconductor switch device (V1). 1), the other end of the seventh resistor (R7) is electrically connected to the drain of the first semiconductor switch device (V1), one end of the sixth resistor (R6) and the output positive electrode of the AC-DC circuit; the source of the second semiconductor switch device (V2) is electrically connected to one end of the sixth capacitor (C6), one end of the tenth resistor (R10), the output negative electrode of the AC-DC circuit and is grounded; the other end of the sixth capacitor (C6) is electrically connected to the other end of the tenth resistor (R10), the other end of the sixth resistor (R6) and the gate of the second semiconductor switch device (V2).
2. The novel shunt release driving circuit according to claim 1 is characterized in that: The first semiconductor switch device (V1) and the second semiconductor switch device (V2) are both MOS tubes.
3. The novel shunt release driving circuit as claimed in claim 2 is characterized in that: The first semiconductor switch device (V1) is a PMOS tube, and the second semiconductor switch device (V2) is an NMOS tube.
4. The novel shunt release driving circuit as claimed in claim 1 is characterized in that: The AC-DC circuit outputs a 12V or 24V direct current voltage.