CN2545750Y - DC speed-regulating switch - Google Patents
DC speed-regulating switch Download PDFInfo
- Publication number
- CN2545750Y CN2545750Y CN 02219943 CN02219943U CN2545750Y CN 2545750 Y CN2545750 Y CN 2545750Y CN 02219943 CN02219943 CN 02219943 CN 02219943 U CN02219943 U CN 02219943U CN 2545750 Y CN2545750 Y CN 2545750Y
- Authority
- CN
- China
- Prior art keywords
- switch
- contact
- effect transistor
- field effect
- pole
- 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.)
- Expired - Lifetime
Links
- 230000005669 field effect Effects 0.000 claims description 11
- 230000002457 bidirectional effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract 1
- 230000005404 monopole Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Control Of Direct Current Motors (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
The utility model provides a direct current speed regulating switch, which comprises an adjusting trigger circuit, an even effect tube and a start-brake switch. The start-brake switch is a monopole two-way switch, which provides high on-off speed, safety and other advantages to the direct current speed regulating switch.
Description
Technical field
The utility model relates to a kind of DC speed regulation switch, especially starts the improvement of a brake switch circuit.
Background technology
At present, known being used for comprises adjusting circuits for triggering, field effect transistor and startup one brake switch such as the DC speed regulation switch of hand held electric tool, as shown in Figure 1, start a brake switch and be adopt two independently the one pole single-way switch change the acquisition function, K1 is a starting switch, and K2 is system merit switch.During operation, when external force applied, K2 disconnected earlier, and K1 connects, and made circuits for triggering and the field effect transistor VT energising work regulated; When external force disappeared, K1 disconnected earlier, made K2 recover normally closed the braking again.Since two independently K switch 1, K2 in use can cause the disconnected and K2 on of K1, directly receive on "+", "-" the two poles of the earth of power supply at the S of field effect transistor VT, D two ends, causes short circuit, the VT overcurrent is burnt out, and break-make speed is slow.
Summary of the invention
In order to overcome the defective that existing DC speed regulation switch causes the field effect transistor overcurrent to burn out easily in the switch braking procedure, the utility model improves startup in the circuit and brake switch circuit, provide a kind of break-make speed fast, safe in utilization DC speed regulation switch.
The technical solution of the utility model is that the startup in the circuit is become an one pole bidirectional switch with the brake switch circuit design; the one pole C contact of K switch connects an end of motor M respectively and regulates the input of circuits for triggering; the A of K switch is connected with the other end of motor and the D utmost point of field effect transistor respectively to contact; the B of switch is connected with "+" end of power supply to contact; the A contact is normally closed point; on the normally closed A contact of K switch, motor is in to have a power failure shuts down on-position.Apply when making K switch turn to the B contact when external force during operation, regulate circuits for triggering energising work; When external force disappeared, K switch had just reset to the moment of A contact, though the power supply of B contact cuts off, but the motor M two ends constitute short circuit through the A of K switch contact, that utilizes armature in the running up of inertia instead scolds electromotive force magnetic field, with the interpolar gravitation of stator, reaches the usefulness of fast braking.
The utility model adopts startup one brake switch of one pole bidirectional switch as the DC speed regulation switch, because the one pole bidirectional switch can only be in two states, be energized or braking, can not connect simultaneously and make field effect transistor cause short circuit, burn out field effect transistor, have advantages such as break-make speed is fast, safe in utilization, contact is reliable.
Description of drawings
Fig. 1 is the electrical schematic diagram of existing DC speed regulation switch.
Fig. 2 is the electrical schematic diagram of the utility model embodiment.
Embodiment
By shown in Figure 2, this DC speed regulation switch comprises regulates circuits for triggering, field effect transistor and startup one brake switch circuit, starting a brake switch is an one pole bidirectional switch K, it comprises one pole C contact and two-way A, B contact, one pole C contact connects motor M one end respectively and regulates the circuits for triggering input, and the A contact is connected with the other end of motor M and the D utmost point of field effect transistor VT respectively, and the B contact is connected with electric current "+" end, the A contact is a normally closed contact, and K switch is normally closed on the A contact.
Claims (1)
- A kind of DC speed regulation switch, comprise and regulate circuits for triggering, field effect transistor and startup one brake switch, it is characterized in that starting a brake switch is an one pole bidirectional switch (K), the one pole C contact of switch connects an end of motor (M) respectively and regulates the input of circuits for triggering, the A of switch is connected with the other end of motor and the D utmost point of field effect transistor respectively to contact, the B of switch is connected to "+" end of contact and power supply, and the A contact is a normally closed contact, on the normally closed A contact of switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02219943 CN2545750Y (en) | 2002-04-12 | 2002-04-12 | DC speed-regulating switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02219943 CN2545750Y (en) | 2002-04-12 | 2002-04-12 | DC speed-regulating switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2545750Y true CN2545750Y (en) | 2003-04-16 |
Family
ID=33698338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02219943 Expired - Lifetime CN2545750Y (en) | 2002-04-12 | 2002-04-12 | DC speed-regulating switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2545750Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029436A (en) * | 2009-10-05 | 2011-04-27 | 株式会社牧田 | Electric power tool |
| WO2012171330A1 (en) * | 2011-06-15 | 2012-12-20 | 欣达贸易有限公司 | Food processing apparatus having rapid braking device |
| CN107953802A (en) * | 2017-11-29 | 2018-04-24 | 平湖市金童电子科技有限公司 | A kind of master control system of juvenile automobile |
-
2002
- 2002-04-12 CN CN 02219943 patent/CN2545750Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029436A (en) * | 2009-10-05 | 2011-04-27 | 株式会社牧田 | Electric power tool |
| CN102029436B (en) * | 2009-10-05 | 2013-03-27 | 株式会社牧田 | Electric power tool |
| WO2012171330A1 (en) * | 2011-06-15 | 2012-12-20 | 欣达贸易有限公司 | Food processing apparatus having rapid braking device |
| CN107953802A (en) * | 2017-11-29 | 2018-04-24 | 平湖市金童电子科技有限公司 | A kind of master control system of juvenile automobile |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120412 Granted publication date: 20030416 |