JP7089716B2 - Switching power circuits for electric lock systems and electric locks - Google Patents

Description

The present invention relates to a switching power supply circuit for an electric lock system electric lock having a surge current protection function.

In the electric lock system, an adapter with lightning surge countermeasures has been proposed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-275836

An object of the present invention is to provide an electric lock system having excellent surge withstand voltage and a switching power supply circuit for the electric lock.

The electric lock system of the present invention is
With an electric lock
Includes a switching power supply circuit for supplying voltage to the electric lock.
The switching power supply circuit includes a primary side power supply and a secondary side power supply.
The primary power supply includes power input windings that form part of the transformer.
The secondary power supply is connected to a secondary winding forming a part of the transformer, a first power supply line connected to a first power input terminal, and a second power input terminal. Including 2 power lines
A capacitor is provided between the power input winding and the secondary winding.

According to the present invention, it is possible to realize an electric lock system having improved lightning surge resistance.

In the present invention, a plurality of the capacitors may be provided in parallel.

In the present invention, the capacitance per electrode area of the capacitor can be increased, and the capacitor can be made stronger against the current destruction mode. In addition, the size of the capacitor can be reduced.

In the present invention, the capacitor can be composed of an element having a withstand voltage of 200 V or more.

In the present invention, the wiring between the capacitor and the secondary winding can be grounded.

In the present invention, a plurality of electrolytic capacitors can be connected in parallel between the first power supply line and the second power supply line. This makes it possible to take measures against momentary power outages.
In the present invention

The primary side power supply includes an IC drive / voltage detection winding and a control IC.
The Vcc terminal of the control IC is connected to the first power supply line via a switching element, and is connected to the first power supply line.
One end of the IC drive / voltage detection winding can be connected to the Vcc terminal of the control IC via a Schottky diode. This makes it possible to improve the stability of the power supply voltage.

In the present invention, an electrolytic capacitor and a Zener diode are connected in parallel between the Schottky diode and the Vcc terminal in order from the Schottky diode side, and the electrolytic capacitor and the other end of the Zener diode are grounded. Can be. This makes it possible to improve the lightning surge resistance performance.

In the present invention, a varistor can be provided between the first power supply line and the second power supply line. This makes it possible to improve the lightning surge resistance performance.

The switching power supply circuit for the electric lock of the present invention is
Including primary side power supply and secondary side power supply,
The primary power supply includes a power input winding.
The secondary side power supply includes a secondary side winding.
A capacitor is provided between the power input winding and the secondary winding.

According to the electric lock system of the present invention and the switching power supply circuit for the electric lock, it has high surge withstand voltage performance.

It is a block diagram of the electric lock system which concerns on embodiment. It is a functional block diagram of the switching power supply circuit for the electric lock which concerns on embodiment. It is a figure which shows the correspondence relationship between the functional block diagram and the electric circuit diagram of the switching power supply circuit for electric lock which concerns on embodiment. It is an electric circuit diagram of the switching power supply circuit for the electric lock which concerns on embodiment. It is an electric circuit diagram of the switching power supply circuit for the electric lock which concerns on embodiment. It is an exploded view of the electric circuit diagram which concerns on FIG. It is an exploded view of the electric circuit diagram which concerns on FIG. It is a figure which shows the application example of the electric lock system which concerns on embodiment. It is explanatory drawing about a lightning surge.

Hereinafter, preferred embodiments of the present invention will be described in detail.

1. 1. Basic Configuration The electric lock system 10 includes a switching power supply circuit 100 and an electric lock 200, as shown in FIG. The switching power supply circuit 100 is for supplying a DC voltage to the electric lock 200. The electric lock 200 is not particularly limited, and any known electric lock 200 can be applied as long as it is driven by a DC voltage. The switching power supply circuit 100 functions as an AC adapter.

As shown in FIG. 2, the switching power supply circuit 100 is a power supply for converting an AC voltage (for example, 100V) into a DC voltage (for example, 22V), and includes a primary side power supply and a secondary side power supply. Specifically, the primary side rectification / smoothing circuit F1, the switch element F2, the IC start circuit F3, the control circuit F4, the transformer F5, the primary / secondary capacitor F6, and the secondary side rectification / smoothing circuit. Including F7. A power supply line from the first power input terminal I1 (hereinafter referred to as "first power supply line") and a power supply line from the ground side power input terminal I2 (hereinafter referred to as "second power supply line") are provided. ing.

The primary side rectifying / smoothing circuit F1 includes a rectifying circuit and a smoothing circuit. The rectifier circuit is composed of a bridge diode D1. The smoothing circuit may be composed of capacitors C1 and C2 and an inductance L1.

A varistor VR1 is provided on the side of the first power input terminal I1 and the second power input terminal I2 of the primary side rectification / smoothing circuit F1. In the first power supply line, a time lag fuse F1 is provided between the first power input terminal I1 and the varistor VR1. In the second power supply line, a resistance FR1 is provided between the varistor VR1 and the bridge diode DB1.

The switch element F2 is a switching element composed of the first switching element Q1 and used to increase the voltage rectified and smoothed by the primary side rectifying / smoothing circuit F1 to a high frequency.

The IC start circuit F3 is for driving the control IC (U1), and includes a second switching element Q2, a Zener diode Z01, a capacitor C4, and an electrolytic capacitor C5. The second switching element Q2 can be, for example, a depletion type.

The control circuit F4 includes a control IC (U1).

The transformer F5 includes a power input winding TS1, a secondary winding TS2, and an IC drive / voltage detection winding TS3. The power input winding TS1 and the IC drive / voltage detection winding TS3 are provided on the primary power supply. The secondary winding TS2 is provided in the secondary power supply. The number of turns of the power input winding TS1 is not particularly limited, but may be, for example, 72. The number of turns of the secondary winding TS2 and the winding TS3 for IC drive / voltage detection is not particularly limited, but may be the same, and may be, for example, 12.

The primary-secondary capacitor F6 includes capacitors CY1 and CY2, and can have a withstand voltage of, for example, 200 V or more, preferably 250 V, more preferably 300 V or more, and F6 is, for example, 800 to 2000 pF, preferably 800. It can be up to 1500 pF, more preferably 800 to 1000 pF. Capacitors CY1 and CY2 can be set by pattern routing and peripheral constants. It is well known that if there is a mismatch in impedance, energy is not transmitted due to energy reflection, but when the impedance between the AC input and common earth was measured and the transfer coefficient between them was examined with a Smith chart, it was 800 to 1000pF is particularly good.

The secondary side rectification / smoothing circuit F7 is for generating a DC power supply.

2. 2. Specific Circuit Configuration The specific circuit configuration of the switching power supply circuit 100 will be described with reference to FIGS. 3 and 4.

The first power input terminal I1 is a non-grounded side power input terminal, and is connected to one end side of the power input winding TS1 via the primary side rectification / smoothing circuit F1. The other end of the power input winding TS1 is connected to a first switching element (for example, a MOS transistor) Q1. When the first switching element Q1 is an IGMP transistor, the other end of the power input winding TS1 is connected to the drain of the nanotube transistor.

The first power input terminal I1 is connected to a second switching element (for example, a MOS transistor) Q2 via a primary side rectification / smoothing circuit F1. When the second switching element Q2 is an µtransistor, the first power input terminal I1 is connected to the drain of this Now's transistor.

When the first switching element Q1 is composed of an IGMP transistor, the gate of the first switching element Q1 is connected to the Output terminal of the power supply control IC (U1), and the source of the first switching element Q1 is grounded. At the same time, it is connected to the Sense terminal of the control IC (U1).

The second power input terminal I2 is a ground side power input terminal.

When the second switching element Q2 is composed of an IGMP transistor, the gate of the second switching element Q2 is connected to the ASU terminal of the control IC (U1), and the source of the second switching element Q2 is for control. It is connected to the terminal Vcc of the IC (U1).

Capacitors CY1 and CY2 are provided in parallel between the power input winding TS1 and the secondary winding TS2. The wiring W3 between the capacitors CY1 and CY2 and the secondary winding TS2 is grounded.

One end of the IC drive / voltage detection winding TS3 is the CFG terminal of the control IC (U1) (to prevent runaway, when an abnormal voltage occurs in the IC drive / voltage detection winding, the IC It is connected to the Vcc terminal of the control IC (U1) via the Schottky diode D6. A capacitor C4, an electrolytic capacitor C5 and a Zener diode Z01 are connected in parallel between the Schottky diode D6 and the Vcc terminal in order from the Schottky diode D6 side, and the other end of the capacitor C4, the electrolytic capacitor C5 and the Zener diode Z01. Is grounded. The Zener diode ZO1 can suppress the influence of the Vcc surge (including static electricity) of the control IC (U1). The Zener diode Z01 can be, for example, a 22V Zener diode. By providing the electrolytic capacitor C5, it is possible to contribute to the improvement of the momentary power failure, especially the rise of the momentary power failure recovery. As the electrolytic capacitor C5, for example, a capacitor having a withstand voltage of 50 V and a capacitance of 2.2 μF is applied. Can be done. By providing the Schottky diode D6, it is possible to secure the stability of the rising oscillation in the load connected state and to make it start up instantly.

The switching power supply circuit 100 can be housed in a housing. A fixing member for fixing the switching power supply circuit 100 can be provided in at least a part of the gap between the switching power supply circuit 100 and the housing. The fixing member can be composed of, for example, an elastic fixing bond (for example, a silicon bond). It can absorb the impact of dropping. Silicon bonds can absorb the vibration of the transformer. If it is a hard bond, it can be prevented from peeling off due to the vibration. From the viewpoint of insulation, a silicon bond is preferable.

5 to 7 are circuit diagrams of a modified example according to the present embodiment.

3. 3. Action Effect There has never been an idea to use a switching power supply for electric locks due to lightning protection. The present inventors have found a technique capable of ensuring high withstand voltage even when a surge voltage is supplied to the switching power supply circuit 100 due to lightning. Normally, the surge withstand voltage is about 3 kV, but according to this circuit, a surge withstand voltage of about 12 kV can be secured.

Instantaneous power outages are caused by overload inrush and problems with residual power of primary energy, and switching regulators are vulnerable to this phenomenon compared to linear type. As a countermeasure for the residual power of the primary energy, for example, the electrolytic capacitors C1 and C2 of the primary side current smoothing circuit can be connected in parallel between the first power supply line and the second power supply line, and the capacitor can be connected in parallel. As C1 and C2, for example, those having a withstand voltage of 200 V and a capacitance of 56 μF can be applied. The capacities of the electrolytic capacitors C1 and C2 can be increased to reduce the voltage drop when the supply voltage is stopped, and the primary supply voltage can be stabilized.

Further, by reducing the capacity of the electrolytic capacitor C5, the rising voltage of Vcc of the control IC can be quickly raised.

According to this embodiment, even if the electricity is cut off like a momentary power failure, the voltage drop drops slowly, and when the electricity is turned on, the voltage drops instantly.
The power adapter of the electric lock can be made lighter.

In order to ensure the stability of the rising oscillation in the load connected state, the Schottky diode D6 can be provided so that the rising can be performed instantly.

The surge spark of the voltage control circuit winding TS1 can be absorbed from the secondary output winding TS3 by the Zener diode ZD1 to eliminate the damage accident of the control IC.

4. Application Example The electric lock system 10 is suitably applied to, for example, an electric lock 200 installed in a place where it may be affected by lightning. Specifically, as shown in FIG. 8, the electric lock system 10 is suitable as an electric lock used for a door 120 such as a front door, and a switching power supply circuit 100 can be connected to the electric locks 200a and 200b. ..

In the electric lock system 10 attached to the door 120 of the entrance or the like, even if a surge current such as a lightning current flows through the switching power supply circuit 100, the withstand voltage of the primary / secondary capacitor F6 is high, so that the switching power supply circuit 100 and electricity A surge current can be passed through the door so that the lock 200 is not destroyed.

5. Lightning surge The lightning surge will be described with reference to FIG. There are two inflow conditions for lightning surges, normal mode and common mode. Normal mode is a surge that enters from a commercial power supply. Common mode is a surge that enters from a house or the external environment. The surge current that strikes the utility pole passes through the inside of the adapter in normal mode. The surge current that strikes a house or the like passes through the inside of the adapter in common mode.

As a countermeasure against surge in normal mode, prevent the surge from affecting the control circuit of the adapter as much as possible, and let the normal surge flow into the ground via the varistor. Specifically, a short circuit at an excessive voltage is realized on the AC input side by using the varistor VR1, and a current of 240 V or more is short-circuited.

On the other hand, the common surge flows into the ground via the capacitors CY1 and CY2. Specifically, the common surge passes from the ground of the output to the capacitor C1, the varistor BR11, and the resistor FR1 via the capacitors CY1 and CY2 (471p), and short-circuits between the primary side and the secondary side. ..

A normal surge is in a surge state at low impedance, and a common surge is in a surge state at high impedance.

1. 1. Lightning surge countermeasures For linear power supplies, the withstand voltage between the primary and secondary windings does not malfunction at 10 kV and does not break at 12 kV. Guarantee may be requested as a standard (hereinafter referred to as "voluntary standard"). Specifically, when the optional standard is the JEC standard, the current limit is a limiter of 100Ω and the maximum short circuit is 120A, so that a high voltage of 12kV is required.

The inventors of the present application have found that there is an accident of damage to the adapter in the normal mode and a damage to the internal circuit of the electric lock in the common mode, and these damage accidents are caused by a lightning surge.

The following were confirmed by specific experiments. As the test conditions, the IEC (International Electrotechnical Commission) stipulates the conditions for applying lightning surges, but the current regulation applied is the peak value (Peak value) from the time of application in OpenMode (common mode). The time to reach is 1.2 μsec, and the time to drop 50% from the peak value is 50 μsec. In ShortMode (normal mode), the time from the time of application to the peak value is 8 μsec, and the time of 50% drop from the peak value is 20 μsec.

(1) It was confirmed that the surge in the normal mode was varistor VR1 (D14 240V), and the linear type adapter improved the disconnection accident of the temperature fuse of the transformer winding by the normal surge. It was confirmed in the IEC test that this improvement guarantees a surge current of about 2000 A.

(2) By changing the bridge diode DB1 from 1A to 2A as a countermeasure against surge in the common mode, it was possible to increase the forward current that cannot be exceeded even for a moment, that is, the peak forward surge current (IFSM). ..

(3) Surge countermeasure capacitors CY1 and CY2 can be configured from 1000pF to two 470pF (para) in parallel to strengthen the surge passing current (increase the passing current from one element to two elements), and JEC In the test, the common surge resistance was improved up to 12 kV.

(4) By adding the Zener diode Z01 to the Vcc of the control IC, the spark voltage between the windings of the transformer was absorbed, and it was confirmed in the electrostatic test ± 20 kV that there was no operation abnormality up to ± 25 kV of IC damage.

2. 2. Measures against momentary power failure If a momentary power failure occurs during locking / unlocking operation, the system will stop and the mechanical operation will stop when the Vcc of the electric lock system drops to the reset voltage (locked state). If the voltage is restored in this state and then restarted, the normal operation is restored. However, due to the confidentiality of the entrance lock, it is required not to malfunction due to a momentary power failure of 200 msec or less, for example.

(1) The electrolytic capacitor of the primary side current smoothing circuit is usually composed of one, but by providing the electrolytic capacitors C1 and C2 of the primary side current smoothing circuit, it has been improved to the same level as the linear type power supply. It was confirmed.

(2) When the electrolytic capacitor C5 of the IC start circuit F3 was set to 2.2 μF, it was confirmed that the rise was quicker when the momentary power failure was restored, and the momentary power failure operation guarantee was improved to 250 msec. The instantaneous power failure guarantee required for the linear type is 200 msec. In addition, when the electrolytic capacitor C5 was set to 4.7 μF, it was not possible to realize a momentary power failure operation guarantee of 200 msec.

3. 3. Load stability Depending on the system, the initialization of the start may be short and it may operate at the same time as the 100V input, and the adapter may not start up due to the load operation (systems such as RFID). This is because a voltage drop may occur before the secondary voltage rises sufficiently, so that the output may be delayed or a sufficient voltage may not be generated.

Regardless of the lightness of the load, the output voltage is highly stable even at low current and overload. The voltage does not increase even with a weak current, and the voltage does not decrease even with an overcurrent, and the same voltage is output. That is, the two control methods can be changed depending on the load state. More specifically, when the load is heavy, the frequency is constant and the pulse width can be changed (the ratio in the frequency is changed) to shift to PWM (Pulse Width Modulation) voltage control, and the load is light at low current. And FWM control can be executed, and the control can be performed by changing the frequency so as not to reduce the efficiency.

(1) Since FWM (Frequency Width Modulation) voltage control, the voltage fluctuation is small with respect to the load fluctuation. It was confirmed that the load fluctuation of the commercially available product was stable at 99.5% according to the present embodiment, while the load fluctuation was 97%.

(2) By changing the rectifying diode for the power supply Vcc of the control IC (U1) from the fast recovery to the Schottky diode D6, the stability at the rising edge in the overloaded state is high, and the forward rising voltage Vf is high. The Schottky diode reduces the voltage. It was confirmed that the control IC (U1) started up smoothly even when the power supply of the control IC (U1) was overloaded. Even if the output of the winding for IC drive / voltage detection is unstable, by applying the Schottky diode D6, it becomes possible to supply a stable voltage to the control IC (U1), and at the maximum load. Even if there is, a stable rise can be realized.

(3) It was confirmed that an AC power adapter with high stability at a low load can be realized by stabilizing the power supply Vcc. It was confirmed that the voltage fluctuation can be reduced because the control IC (U1) operates stably even with a low load (small fluctuation from no load).

The present embodiment can be modified in various ways within the scope of the present invention.

The electric lock system of the present invention and the switching power supply circuit for electric locks can be widely applied to electric locks for doors such as entrances.

10 Electric lock system 100 Switching power supply circuit 200 Electric lock I1 First power input terminal I2 Second power input terminal TS1 Power input winding TS2 Secondary winding TS3 IC drive / voltage detection winding

Claims (9)

With an electric lock
Includes a switching power supply circuit for supplying voltage to the electric lock.
The switching power supply circuit includes a primary side power supply and a secondary side power supply.
The primary power supply includes a power input winding constituting a part of the transformer, a first power supply line connected to the first power input terminal, and a second power input terminal connected to the second power input terminal. Including power lines and
The secondary power supply includes a secondary winding that constitutes a part of the transformer.
A capacitor is provided between the power input winding and the secondary winding .
The capacitors are electric lock systems provided in parallel . With an electric lock
Includes a switching power supply circuit for supplying voltage to the electric lock.
The switching power supply circuit includes a primary side power supply and a secondary side power supply.
The primary power supply includes a power input winding constituting a part of the transformer, a first power supply line connected to the first power input terminal, and a second power input terminal connected to the second power input terminal. Including power lines and
The secondary power supply includes a secondary winding that constitutes a part of the transformer.
A capacitor is provided between the power input winding and the secondary winding.
The capacitor is an electric lock system composed of elements having a withstand voltage of 200 V or more. With an electric lock
Includes a switching power supply circuit for supplying voltage to the electric lock.
The switching power supply circuit includes a primary side power supply and a secondary side power supply.
The primary power supply includes a power input winding constituting a part of the transformer, a first power supply line connected to the first power input terminal, and a second power input terminal connected to the second power input terminal. Including power lines and
The secondary power supply includes a secondary winding that constitutes a part of the transformer.
A capacitor is provided between the power input winding and the secondary winding.
An electric lock system in which the wiring between the capacitor and the secondary winding is grounded. With an electric lock
Includes a switching power supply circuit for supplying voltage to the electric lock.
The switching power supply circuit includes a primary side power supply and a secondary side power supply.
The primary power supply includes a power input winding constituting a part of the transformer, a first power supply line connected to the first power input terminal, and a second power input terminal connected to the second power input terminal. Including power lines and
The secondary power supply includes a secondary winding that constitutes a part of the transformer.
A capacitor is provided between the power input winding and the secondary winding.
An electric lock system in which a plurality of electrolytic capacitors are connected in parallel between the first power supply line and the second power supply line. With an electric lock
Includes a switching power supply circuit for supplying voltage to the electric lock.
The switching power supply circuit includes a primary side power supply and a secondary side power supply.
The primary power supply includes a power input winding constituting a part of the transformer, a first power supply line connected to the first power input terminal, and a second power input terminal connected to the second power input terminal. Including power lines and
The secondary power supply includes a secondary winding that constitutes a part of the transformer.
A capacitor is provided between the power input winding and the secondary winding.
The primary side power supply includes an IC drive / voltage detection winding and a control IC.
The control IC includes a Vcc terminal and
The Vcc terminal of the control IC is connected to the first power supply line via a switching element, and is connected to the first power supply line.
An electric lock system in which one end of a winding for driving an IC and for detecting a voltage is connected to a Vcc terminal of the control IC via a Schottky diode . In claim 5 ,
An electrolytic capacitor and a Zener diode are connected in parallel between the Schottky diode and the Vcc terminal in order from the Schottky diode side, and the electrolytic capacitor and the other end of the Zener diode are grounded electricity. Lock system. Including primary side power supply and secondary side power supply,
The primary power supply includes a power input winding.
The secondary side power supply includes a secondary side winding.
A capacitor is provided between the power input winding and the secondary winding .
The capacitors are switching power supply circuits for electric locks that are provided in parallel . Including primary side power supply and secondary side power supply,
The primary power supply includes a power input winding.
The secondary side power supply includes a secondary side winding.
A capacitor is provided between the power input winding and the secondary winding.
The capacitor is a switching power supply circuit for an electric lock, which is composed of an element having a withstand voltage of 200 V or more. Including primary side power supply and secondary side power supply,
The primary power supply includes a power input winding.
The secondary side power supply includes a secondary side winding.
A capacitor is provided between the power input winding and the secondary winding.
A switching power supply circuit for an electric lock in which the wiring between the capacitor and the secondary winding is grounded.

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