KR860000899Y1 - Power supply circuit for a receiver - Google Patents

Abstract

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Description

Power supply circuit of police receiver

Circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: Receiver 2: Band Pass Filter

3: load 4: rectifier

Q ₁ , Q ₂ . Q ₅ : transistors R ₁ , R ₂ . R ₁₂ : resistance

C ₁ , C ₂ : condenser D ₁ , D ₂ : diode

S: Push switch

The present invention relates to a power supply circuit of a police receiver that can supply power to a receiver by a specific frequency. Police receivers that are paid to individuals are compact and are only capable of receiving status signals according to instructions, so they must be kept open at all times, preventing unnecessary power consumption and being common to all areas. Since the signal is sent out, a problem arises in that an unnecessary reception signal must always be received.

Therefore, when a specific frequency signal is applied, power is supplied to drive the receiver, which is paid to the individual, so that it needs to be driven as a normal receiver.In the unnecessary state, only a small power consumption (Vcc) is used to consume unnecessary power. It was desirable to prevent.

However, when the receiver is moved to a building or basement in a city such as a receiver, the radio wave is disturbed and the receiver cannot receive a specific frequency. Therefore, if necessary, the receiver must be manually opened by attaching a push switch. It must be taken into account.

An object of the present invention is to provide a driving power to a receiver by a specific frequency signal, at the same time for the police to be able to control (on, off) the driving power of the receiver out of the area where radio waves are disturbed or by a push switch as needed. To provide a power supply circuit of a receiver. In a receiving circuit that controls an output transistor by a specific frequency and supplies power to a load, the outputs of the rectifier can be driven back through the transistor to maintain a constant state (conduction and interruption). After the transistor is configured to control, the charge / discharge circuit is connected to the push switch and configured to control the reverse driving of the transistor.

This will be described in detail with reference to the accompanying drawings.

A band pass filter (2) passing only a specific frequency is connected to the receiver (1) connected to the antenna, and the rectifier (4) consisting of a capacitor (C ₁ ) diode (D ₁ ) (D ₂ ) is connected to a specific frequency signal. The double voltage is outputted according to whether or not is applied, and the driving power is supplied to the load 3 by controlling the transistors Q ₅ and Q _{6 on} the output side, which is the same as that widely used in general receiver circuits. .

Then, the power rectified in the rectifying section (4) is a PNP transistor through a resistor (R ₂₎ in the emitter teocheuk configuration through a resistor (R ₁₎ to be applied to the base side of the transistor (Q ₁₎ and the transistor (Q ₁₎ ( The base bias voltage of Q ₂ ) is configured to be applied so that the transistors Q ₁ and Q ₂ are driven opposite to each other, and are distributed to the collector side of the transistor Q ₂ by distribution resistors R ₄ -R ₇ . After connecting and configuring the base and the collector side of the transistors Q ₃ and Q ₄ which are driven backward, the power source VCC distributed to the resistors R _{6 to} R ₁₀ is connected to the base of the transistors Q ₃ and Q ₄ . Transistor Q ₃ maintains continuous conduction state when supplied to the collector side and a specific frequency is applied, and transistor Q ₄ together with transistor Q ₂ always maintains conduction state in a state in which the receiver is not driven. Configure it to be possible.

Then, a charge / discharge circuit is composed of resistors R ₁₂ (R ₁₃ ) and capacitors C ₂ between the output transistors Q ₅ and Q ₆ , and the transistors Q ₃ and Q _{4 are} formed through the push switch S. ) Can be controlled by the push switch (S) to charge the capacitor (C ₂ ) of the charge-discharge circuit when the power supply of the receiver is cut off, and by the push switch (S) when the power supply of the receiver The capacitor C ₂ is discharged so that the transistors Q ₃ and Q ₆ can be driven. In the drawings, reference numeral R ₁₁ is a resistor, and A, B, C, and D are norwood points given for convenience in describing the present invention.

According to the present invention configured as described above, the power supply VCC is charged to the capacitor C ₂ through the resistors R ₁₁ and R ₁₃ while the receiver circuit is not initially supplied with the load 3. Initially, when the transistor (Q ₁ ) is in the shut-off state, the reverse-driven PNP transistor (Q ₂ ) is turned on so that the power distributed through the resistor (R ₃ ) (R ₄ ) is the resistor (R ₅ ) (R ₇ ). ), since the base bias voltage of the transistor (Q4) it is applied via a transistor (Q ₄₎ conductive. That is, in a state in which a specific frequency is not applied to the receiver, only the transistors Q ₂ and Q ₄ are turned on, and the power supply VCC is not supplied to the load 3. It is possible to prevent unnecessary power consumption caused by supplying driving power to the load 3 for maintenance. In this state, when the specified frequency is applied to the receiver 1 through the antenna, the state signal rectified by the rectifier 4 through the band pass filter 2 is transmitted through the resistor R ₁ through the transistor Q ₁ . Since the transistor is applied to the base side of the transistor Q ₁ , the PNP transistor Q ₂ , which is reversely driven, is kept in a blocked state.

Therefore, when the transistor Q ₂ is cut off, the nodal point C is put in a low potential state, and the transistor Q ₄ is cut off, and the power supply VCC is made of a resistor R ₆ (R ₈ ) (R ₉ ). (R ₁₀₎ distributed is supplied to the base bias voltage to the transistor (Q ₃₎ (Q ₅₎ the so transistor (Q ₃₎ (Q ₅₎ is the conductive capacitor at the time of conduction of the transistor (Q ₅₎ (C ₂₎ Is discharged through the resistor R ₁₃ , and the base point A of the base side of the PNP transistor Q ₆ is in a low potential state, so that the transistor Q ₆ conducts to supply driving power to the load 3. It becomes possible. That is, in the present invention, after the transistor Q ₁ is turned on by a specific frequency signal, the power supply VCC is a resistor R ₆ in a state where the transistor Q ₂ (Q ₄ ) is cut off even though the specified frequency signal is not continuously applied. Since it is supplied to the base side of the transistor Q ₃ through R ₁₀ ), it is effective to supply the continuous driving power supply VCC to the load 3. By calling the selected police officer, the receiver 1 can perform reception as a general reception circuit, thereby eliminating the inconvenience of having to receive the unnecessary contents by always opening the receiver (ON) in the conventional receiver.

In the present invention, when the driving power is supplied to the load 3 by a specific frequency signal, it is possible to maintain a continuous reception state. When unnecessary reception contents are continuously applied, the push switch S is pressed to the load 3. In the receiving state, the capacitor C ₂ of the charging and discharging circuit is discharged through the resistor R _13. Therefore, when the push switch S is pressed, the resistors R ₆ -R _Since the bias voltage supplied through ₁₀ ) is charged to the capacitor C ₂ , the transistor Q ₃ and Q ₅ are cut off and the norm point A is in a high potential state, so that the transistor Q ₆ is cut off. .

Therefore, the power supply VCC supplied to the load 3 is cut off, and the transistors Q ₂ and Q ₄ are driven as in the initial state, and the capacitor C ₂ of the charge / discharge circuit can maintain the charged state.

At this time, when the push switch S is manually pressed and released again, the voltage charged in the capacitor C ₂ is supplied with a bias voltage to the base side of the transistor Q ₃ through the resistor R ₁₂ and the push switch S so as to conduct. Since the transistors Q ₅ and Q ₆ are turned on to supply power to the load 3, they are supplied to the receiver whenever the capacitor C ₂ of the charge / discharge circuit is charged and discharged by the push switch S. It is possible to control the driving power to prevent the unnecessary power consumption from being consumed by the receiver circuit by opening the receiver from time to time after passing through the high-rise building and basement where the radio wave is disturbed so that the called state can be known. In this case, it is possible to prevent the point that the received signal cannot be detected as a push switch.

As described above, the present invention enables the receiver circuit to operate normally by supplying driving power to the load 3 of the receiver circuit only when a specific frequency state signal is applied, so that each individual can be called separately. It is possible to prevent the inconvenience and power consumption to be turned on and control the charging and discharging of the charging and discharging circuit with a push switch to provide a power supply merit for the police receiver that can be separately received if necessary. You can do it.

Claims (1)

(Correction) In a receiving circuit configured to provide a specific frequency receiver 1, a band pass filter 2, and a rectifier 4 to control the output transistors Q ₅ and Q ₆ to supply power to the load 3. , The output of the rectifier 4 is connected to the distribution resistors R _5- R ₉ through the transistors Q ₁ and Q ₂ to control the transistors Q ₃ and Q ₄ which are driven backwards to each other so that a constant driving state is achieved. After the structure is configured to maintain the voltage, a charge / discharge circuit composed of a resistor (R ₁₂ ) (R ₁₃ ) and a capacitor (C ₂ ) is connected to the push switch (S) between the transistors (Q ₅ ) and (Q ₆ ) so that the transistor (Q _3). Power supply circuit of the police receiver configured to control (Q ₄ ).