CN208623331U - A kind of Vehicular intercom protection circuit - Google Patents
A kind of Vehicular intercom protection circuit Download PDFInfo
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- CN208623331U CN208623331U CN201821260511.7U CN201821260511U CN208623331U CN 208623331 U CN208623331 U CN 208623331U CN 201821260511 U CN201821260511 U CN 201821260511U CN 208623331 U CN208623331 U CN 208623331U
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Abstract
The utility model discloses a kind of Vehicular intercoms to protect circuit, can play the circuit of effective protection in power supply overpressure problems to the Vehicular intercom of Width funtion power supply.The protection circuit of the utility model is applied to the energization input of Vehicular intercom; it is switched using miniature relay as power supply protection; using zener diode as power supply over-voltage detection reference; and the control that Vehicular intercom whether is able to enter to external power supply power supply is realized by the switch of triode drive control relay, the utility model simple circuit, at low cost, performance is brilliant.
Description
Technical field
The utility model relates to Vehicular intercom technical fields, and in particular to a kind of Vehicular intercom protection circuit.
Background technique
Existing Vehicular intercom often works under two series connection lead storage batteries (24V) on current large car,
And this Vehicular intercom typically is provided with the power supply system (between 12-30V) of adaptive wide supply voltage range, but when in vapour
When vehicle starts or steps on the gas, the up to transient surge voltage of 80V can be generated, can bear far beyond Vehicular intercom
Supply district, will cause the damage of Vehicular intercom.
Utility model content
The purpose of the utility model is to provide a kind of Vehicular intercoms with over-voltage detection protection to protect circuit.The protection
Circuit is simple and convenient, and practicability, safety, high reliablity.
To achieve the goals above, the utility model adopts the following technical solution:
A kind of Vehicular intercom protection circuit, the protection circuit connection are defeated in the power supply of external power supply and Vehicular intercom
Enter between end, including reverse protection diode, overvoltage crowbar, high voltage switching circuit, relay protection circuit, low-voltage
Switch and relay switching circuit；
The output of external power supply is divided into two-way, is connected to Vehicular intercom by the relay switching circuit all the way, separately
The anode of the reverse protection diode is connected all the way；
The cathode of the reverse protection diode is divided into five tunnels；The first via is connected to the relay of the relay switching circuit
One end of device coil；Second tunnel is sequentially connected the overvoltage crowbar and the high voltage switching circuit；Third road is connected to
The input terminal of the high voltage switching circuit；4th tunnel is sequentially connected the relay protection circuit and the low-voltage switches；
5th tunnel is connected to the input terminal of the low-voltage switches；The output end of the high voltage switching circuit and the low-voltage switches
Output end be commonly connected to the relay switching circuit relay coil the other end, i.e., the described relay switching circuit
Control terminal.
The overvoltage crowbar includes that sequentially connected second diode, the first zener diode and the first control are opened
It closes.
First zener diode is 27V zener diode.
The high voltage switching circuit include the second control switch and be connected to this second control switch output end the
One resistance.
The relay protection circuit includes the second zener diode mutually concatenated and third control switch.
Second zener diode is 16V zener diode.
The relay switching circuit includes relay and third diode, the both ends point of the normally opened contact of the relay
Not Lian Jie external power supply and Vehicular intercom, the power end of the coil of the relay and the cathode of the third diode are common
It is connected to the cathode of the reverse protection diode, the anode of the control terminal of the coil of the relay and the third diode
It is commonly connected to the output end of the high voltage switching circuit and the output end of the low-voltage switches.
After adopting the above scheme, the Vehicular intercom of the utility model protects circuit, is provided with reverse protection diode, mistake
Voltage protection circuit, high voltage switching circuit, relay protection circuit, low-voltage switches and relay switching circuit, using relay
Device switching circuit is switched as power supply protection, realizes power supply over-voltage detection by overvoltage crowbar, and pass through high-voltage switch
Whether the realization of the switch of circuit and low-voltage switches drive control relay switching circuit is able to enter vehicle to external power supply power supply
Carry intercom control, the protection circuit of the utility model is simple and convenient, and with practicability, safety, high reliablity spy
Point.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model；
Fig. 3 is the pcb board positive structure schematic of the protection circuit of the utility model；
Fig. 4 is the pcb board reverse structure schematic of the protection circuit of the utility model；
Fig. 5 is the structural schematic diagram of the utility model；
Fig. 6 is the implementation diagram that the utility model is applied to Vehicular intercom.
Specific embodiment
The utility model relates to a kind of Vehicular intercoms to protect circuit, as shown in Fig. 1, Fig. 6, protect circuit connection in outside
Between power supply 1 and the energization input of Vehicular intercom 8, protection circuit includes reverse protection diode 2, overvoltage crowbar 3,
High voltage switching circuit 4, relay protection circuit 5, low-voltage switches 6 and relay switching circuit 7.As shown in figure 5, reversed protect
Diode 2 is protected, overvoltage crowbar 3, high voltage switching circuit 4, relay protection circuit 5, low-voltage switches 6 and relay are opened
Powered-down road 7 is installed on jointly in a shell 9.
The output of external power supply 1 is divided into two-way, and a-road-through crosses relay switching circuit 7 and is connected to Vehicular intercom 8, another
The anode of road connection reverse protection diode 2.
The cathode of reverse protection diode 2 is divided into five tunnels；The first via is connected to the power end of relay switching circuit 7；The
Two tunnels are sequentially connected overvoltage crowbar 3 and high voltage switching circuit 4；Third road is connected to the input of high voltage switching circuit 4
End；4th tunnel is sequentially connected relay protection circuit 5 and low-voltage switches 6；5th tunnel is connected to the input of low-voltage switches 6
End；The output end of high voltage switching circuit 4 and the output end of low-voltage switches 6 are commonly connected to the control of relay switching circuit 7
End processed.
As shown in Figure 1, 2, overvoltage crowbar 3 includes sequentially connected second diode 31 (D6), two pole of the first pressure stabilizing
Pipe 32 (D3) and the first control switch 33 (triode Q1)；High voltage switching circuit 4 includes 41 (triode of the second control switch
) and first resistor 42 (protective resistance R5) Q2；Relay protection circuit 5 includes third control switch 52 (triode Q4) and second
Zener diode 51 (D5)；Low-voltage switches 6 use triode Q3；Relay switching circuit 7 includes relay 71 (K1) and the
Three diodes 72 (D2).
As shown in Fig. 2, Fig. 5, external power supply is introduced by power interface anode P1, power interface cathode P2, is divided into two-way, and one
Road is connected to Vehicular intercom by voltage output interface P4 by the normally opened contact of relay 71；Another way connects reverse protection two
The anode of pole pipe D1.
The cathode of reverse protection diode D1 is divided into five tunnels, and the first via is connected to one end and two poles of the coil of relay K1
The cathode of pipe D2；Second tunnel is connected to the anode of diode D6 by resistance R1, and the cathode of diode D6 is connected to two pole of pressure stabilizing
The cathode of pipe D3, the anode of zener diode D3 are connected to the base stage of triode Q1, and the collector of triode Q1 is connected to three poles
The base stage of pipe Q2；Third road is connected to the base stage of triode Q2 by resistance R3, and the collector of triode Q2 passes through protective resistance
R5 is connected to the collection of the other end (control terminal of relay K1) of the coil of relay K1, the anode of diode D2 and triode Q3
Electrode；4th tunnel is connected to the cathode of zener diode D5 by resistance R2, and the anode of zener diode D5 is connected to triode
The base stage of Q4, the collector of triode Q4 are connected to the base stage of triode Q3；5th tunnel is connected to triode Q3 by resistance R4
Base stage.Triode Q1, triode Q2, triode Q3 and triode Q4 emitter be grounded.
In the utility model, zener diode D3 uses 27V zener diode；Zener diode D5 uses 16V pressure stabilizing two
Pole pipe.Triode Q1, triode Q2, triode Q3 and triode Q4 are all made of NPN triode.
The Vehicular intercom of the utility model protects circuit, and the structural schematic diagram of the obverse and reverse of pcb board is respectively such as
Shown in Fig. 3 and Fig. 4.
The working principle of the utility model is as follows:
The working principle of reverse protection circuit 2: special according to the switch of diode when the positive and negative anodes of external power supply 1 are reversed
Property, under backward voltage effect, reverse protection diode 2 (D1) is in off state, is equivalent to the switch of a disconnection, promotes
Relay 71 (K1) is in original off-state, and input voltage is intercepted, and realizes reverse protection function with this.
The working principle of low-voltage switches circuit 6: when the supply voltage of external power supply 1 is less than 16V, via reverse protection
Diode 2 (D1) has given the high level of the pole B one of low-voltage switches 6 (triode Q3), promotes low-voltage switches 6 (triode Q3)
The pole C and the conducting of the pole E, while making the control terminal low level of relay 7 (K1) so that the coil of relay K1 is powered, relay
The normally opened contact of K1 is attracted, and the supply voltage of external power supply 1 is exported via the normally opened contact of relay 7 (K1) to Vehicular intercom
8。
The working principle of relay protection circuit 5: the rated operational voltage due to operating voltage no more than relay is kept away
Exempt from the coil burnout of relay, so when the supply voltage of external power supply 1 is between 16V~28.5V, the second zener diode
51 (16V zener diode D5) breakdown, has given one high level of B grade of third control switch 52 (triode Q4), so that third
The pole C of control switch 52 (triode Q4) and the conducting of the pole E, while the B grade of low-voltage switches 6 (triode Q3) being made to be low level,
So that low-voltage switches 6 (triode Q3) are in off state, the normally opened contact of the coil blackout of relay K1, relay K1 is disconnected
It opens, relay 71 (K1) is in original off-state, and input voltage is intercepted, and realizes relay over-voltage protecting function with this；
The working principle of high voltage switching circuit 4: when the supply voltage of external power supply 1 is between 16V~28.5V, warp
One high level of B grade that the second control switch 41 (triode Q2) has been given by reverse protection diode 2 (D1), promotes the second control
The pole C of switch 41 (triode Q2) and the conducting of the pole E, and while process first resistor 42 (protective resistance R5), make relay 7
(K1) control terminal low level, so that the coil of relay K1 is powered, the normally opened contact of relay K1 is attracted, external power supply 1
Supply voltage is exported via the normally opened contact of relay 7 (K1) to Vehicular intercom 8, while realizing protective relay with this,
High voltage remains to the function of normal power supply.
The working principle of overvoltage crowbar 3: when the supply voltage of external power supply 1 is greater than 28.5V, via reverse protection
Diode 2 (D1) and the second diode 31 (D6), the first zener diode 32 (27V zener diode D3) is breakdown, has given
One high level of B grade of one control switch 33 (triode Q1), so that the pole C and the pole E of the first control switch 33 (triode Q1)
Conducting, while the B grade of the second control switch 41 (triode Q2) being made to be low level, so that the second control switch 41 (triode Q2)
Normally opened contact in off state, the coil blackout of relay K1, relay K1 disconnects, and relay 71 (K1) is in original disconnected
Open state intercepts input voltage, realizes over-voltage protecting function with this.
The above embodiments of the present invention is merely examples for clearly illustrating the present invention, and is not
Limitations of the embodiments of the present invention, for those of ordinary skill in the art, on above explained basis
On can also make the variation or variation of other different structure forms.There is no need and unable to give thoroughly all embodiments
It lifts.And the obvious changes or variations that these spirit for belonging to the utility model are extended out are still in the utility model
Among protection scope.
Claims (7)
1. a kind of Vehicular intercom protects circuit, it is characterised in that: the protection circuit connection is in external power supply and vehicle-mounted intercommunication
Between the energization input of machine, including reverse protection diode, overvoltage crowbar, high voltage switching circuit, relay protection
Circuit, low-voltage switches and relay switching circuit；
The output of external power supply is divided into two-way, is connected to Vehicular intercom, another way by the relay switching circuit all the way
Connect the anode of the reverse protection diode；
The cathode of the reverse protection diode is divided into five tunnels；The first via is connected to the relay line of the relay switching circuit
One end of circle；Second tunnel is sequentially connected the overvoltage crowbar and the high voltage switching circuit；Third road is connected to described
The input terminal of high voltage switching circuit；4th tunnel is sequentially connected the relay protection circuit and the low-voltage switches；5th
Road is connected to the input terminal of the low-voltage switches；The output end of the high voltage switching circuit and the low-voltage switches it is defeated
Outlet is commonly connected to the other end of the relay coil of the relay switching circuit, i.e., the control of the described relay switching circuit
End processed.
2. a kind of Vehicular intercom according to claim 1 protects circuit, it is characterised in that: the overvoltage crowbar packet
Include sequentially connected second diode, the first zener diode and the first control switch.
3. a kind of Vehicular intercom according to claim 2 protects circuit, it is characterised in that: first zener diode
For 27V zener diode.
4. a kind of Vehicular intercom according to claim 1 protects circuit, it is characterised in that: the high voltage switching circuit
First resistor including the second control switch He the output end for being connected to this second control switch.
5. a kind of Vehicular intercom according to claim 1 protects circuit, it is characterised in that: the relay protection circuit
Including the second zener diode mutually concatenated and third control switch.
6. a kind of Vehicular intercom according to claim 5 protects circuit, it is characterised in that: second zener diode
For 16V zener diode.
7. a kind of Vehicular intercom according to claim 1 protects circuit, it is characterised in that: the relay switching circuit
Including relay and third diode, the both ends of the normally opened contact of the relay are separately connected external power supply and vehicle-mounted intercommunication
The cathode of machine, the power end of the coil of the relay and the third diode is commonly connected to the reverse protection diode
Cathode, the anode of the control terminal of the coil of the relay and the third diode is commonly connected to the high-voltage switch
The output end of the output end of circuit and the low-voltage switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821260511.7U CN208623331U (en) | 2018-08-06 | 2018-08-06 | A kind of Vehicular intercom protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821260511.7U CN208623331U (en) | 2018-08-06 | 2018-08-06 | A kind of Vehicular intercom protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208623331U true CN208623331U (en) | 2019-03-19 |
Family
ID=65708918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821260511.7U Active CN208623331U (en) | 2018-08-06 | 2018-08-06 | A kind of Vehicular intercom protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208623331U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416975A (en) * | 2019-07-12 | 2019-11-05 | 深圳市首航通信股份有限公司 | A kind of power protecting circuit and new-energy automobile |
| WO2023092883A1 (en) * | 2021-11-29 | 2023-06-01 | 科博达技术股份有限公司 | Protective circuit capable of preventing error voltage access |
-
2018
- 2018-08-06 CN CN201821260511.7U patent/CN208623331U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416975A (en) * | 2019-07-12 | 2019-11-05 | 深圳市首航通信股份有限公司 | A kind of power protecting circuit and new-energy automobile |
| WO2023092883A1 (en) * | 2021-11-29 | 2023-06-01 | 科博达技术股份有限公司 | Protective circuit capable of preventing error voltage access |
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